The LFCS series provides an outlet for the fast-growing body of work in the logical foundations of computer science, e.g., areas of fundamental theoretical logic related to computer science.

The LFCS series provides an outlet for the fast-growing body of work in the logical foundations of computer science, e.g., areas of fundamental theoretical logic related to computer science.

This workshop is organized by the interdisciplinary research group investigating the Structure and Development of Understanding Actions and Reasons, funded by the German Research Foundation (DFG), the Swiss National Fund (SNF) and the Austrian Science Fund (FWF).

Invited Speakers: Caroline T. Arruda, Daniel Povinelli,  Eva Rafetseder and Michael Tomasello.

The LICS Symposium is an annual international forum on theoretical and practical topics in computer science that relate to logic, broadly construed.

The 35th Annual ACM/IEEE Symposium on Logic in Computer Science (LICS 2020) has originally been planned to be held in Beijing (China), and then moved to Saarland Informatics Campus in Saarbrücken (Germany). Due to the pandemic, the symposium is now held online in the period July 8-11, with satellite workshops on July 6-7, and in virtual co-location with ICALP 2020.

In more than a decade of research, it has been established that a wide variety of state-based dynamical systems, like transition systems, automata (including weighted and probabilistic variants), Markov chains, and game-based systems, can be treated uniformly as coalgebras. Coalgebra has developed into a field of its own interest presenting a deep mathematical foundation, a growing field of applications, and interactions with various other fields. Established in 1998, the aim of the CMCS workshops is to bring together researchers with a common interest in the theory of coalgebras, their logics, and their applications. As the workshop serie strives to maintain breadth in its scope, participation by researchers in neighbouring areas is strongly encouraged.

CMCS 2020 will be held virtually, as a series of approximately three hour sessions spread across five weeks.

The LFCS series provides an outlet for the fast-growing body of work in the logical foundations of computer science, e.g., areas of fundamental theoretical logic related to computer science.

This workshop is organized by the interdisciplinary research group investigating the Structure and Development of Understanding Actions and Reasons, funded by the German Research Foundation (DFG), the Swiss National Fund (SNF) and the Austrian Science Fund (FWF).

Invited Speakers: Caroline T. Arruda, Daniel Povinelli,  Eva Rafetseder and Michael Tomasello.

The International Symposium on Artificial Intelligence and Mathematics (ISAIM), is a biennial meeting that fosters interactions between mathematics, theoretical computer science, and artificial intelligence. This will be the sixteenth Symposium in the series, sponsored by Florida Atlantic University and the Annals of Mathematics and Artificial Intelligence. Traditionally, the Symposium attracts participants from a variety of disciplines, thereby providing a unique forum for scientific exchange. The three-day Symposium includes invited speakers, presentations of technical papers, and special topic sessions.

*Formal Methods in Mathematics / Lean Together 2020* will run from Monday, January 6 to Friday, January 10, 2020 at Carnegie Mellon University, in Pittsburgh, Pennsylvania. The meeting is a successor to Lean Together 2019.

The first three days will focus on formal methods in pure and applied mathematics, including interactive theorem proving, automated reasoning, verification of symbolic and numeric computation, and general mathematical infrastructure. The last two days will be devoted to specifically to the Lean Theorem Prover and its core library, mathlib. Users and library developers will have opportunities to present work in progress and discuss plans for the future.

Attendance is free and open to the public, but we ask you to let us know by December 6 if you plan to come.

The LFCS series provides an outlet for the fast-growing body of work in the logical foundations of computer science, e.g., areas of fundamental theoretical logic related to computer science.

The International Symposium on Artificial Intelligence and Mathematics (ISAIM), is a biennial meeting that fosters interactions between mathematics, theoretical computer science, and artificial intelligence. This will be the sixteenth Symposium in the series, sponsored by Florida Atlantic University and the Annals of Mathematics and Artificial Intelligence. Traditionally, the Symposium attracts participants from a variety of disciplines, thereby providing a unique forum for scientific exchange. The three-day Symposium includes invited speakers, presentations of technical papers, and special topic sessions.

*Formal Methods in Mathematics / Lean Together 2020* will run from Monday, January 6 to Friday, January 10, 2020 at Carnegie Mellon University, in Pittsburgh, Pennsylvania. The meeting is a successor to Lean Together 2019.

The first three days will focus on formal methods in pure and applied mathematics, including interactive theorem proving, automated reasoning, verification of symbolic and numeric computation, and general mathematical infrastructure. The last two days will be devoted to specifically to the Lean Theorem Prover and its core library, mathlib. Users and library developers will have opportunities to present work in progress and discuss plans for the future.

Attendance is free and open to the public, but we ask you to let us know by December 6 if you plan to come.

The International Symposium on Artificial Intelligence and Mathematics (ISAIM), is a biennial meeting that fosters interactions between mathematics, theoretical computer science, and artificial intelligence. This will be the sixteenth Symposium in the series, sponsored by Florida Atlantic University and the Annals of Mathematics and Artificial Intelligence. Traditionally, the Symposium attracts participants from a variety of disciplines, thereby providing a unique forum for scientific exchange. The three-day Symposium includes invited speakers, presentations of technical papers, and special topic sessions.

*Formal Methods in Mathematics / Lean Together 2020* will run from Monday, January 6 to Friday, January 10, 2020 at Carnegie Mellon University, in Pittsburgh, Pennsylvania. The meeting is a successor to Lean Together 2019.

The first three days will focus on formal methods in pure and applied mathematics, including interactive theorem proving, automated reasoning, verification of symbolic and numeric computation, and general mathematical infrastructure. The last two days will be devoted to specifically to the Lean Theorem Prover and its core library, mathlib. Users and library developers will have opportunities to present work in progress and discuss plans for the future.

Attendance is free and open to the public, but we ask you to let us know by December 6 if you plan to come.

We are seeking early career scholars (by your own definition) interested in the history or sociology of the modern theoretical and mathematical sciences for an interdisciplinary 2-day workshop exploring the methods and implications of studying the local and global scales of seemingly universal knowledge. Conversations will be guided by a fantastic group of senior scholars: Martina Merz (Alpen-Adria-Universität), Tatiana Roque (Universidade Federal do Rio de Janeiro), David Aubin (Sorbonne Universit́é), and Ursula Martin (Oxford and Edinburgh).

This meeting aims to bring together young researchers interested in model theory. It will feature a mini-course, invited talks by established academics, and contributed talks by postgraduate researchers. Accommodation will be provided for a limited number of participants. Supported by LMS, University of Leeds, and the British Logic Colloquium.

*Formal Methods in Mathematics / Lean Together 2020* will run from Monday, January 6 to Friday, January 10, 2020 at Carnegie Mellon University, in Pittsburgh, Pennsylvania. The meeting is a successor to Lean Together 2019.

The first three days will focus on formal methods in pure and applied mathematics, including interactive theorem proving, automated reasoning, verification of symbolic and numeric computation, and general mathematical infrastructure. The last two days will be devoted to specifically to the Lean Theorem Prover and its core library, mathlib. Users and library developers will have opportunities to present work in progress and discuss plans for the future.

Attendance is free and open to the public, but we ask you to let us know by December 6 if you plan to come.

We are seeking early career scholars (by your own definition) interested in the history or sociology of the modern theoretical and mathematical sciences for an interdisciplinary 2-day workshop exploring the methods and implications of studying the local and global scales of seemingly universal knowledge. Conversations will be guided by a fantastic group of senior scholars: Martina Merz (Alpen-Adria-Universität), Tatiana Roque (Universidade Federal do Rio de Janeiro), David Aubin (Sorbonne Universit́é), and Ursula Martin (Oxford and Edinburgh).

This meeting aims to bring together young researchers interested in model theory. It will feature a mini-course, invited talks by established academics, and contributed talks by postgraduate researchers. Accommodation will be provided for a limited number of participants. Supported by LMS, University of Leeds, and the British Logic Colloquium.

The Society for Philosophy of Science in Practice (SPSP) is an interdisciplinary community of scholars who approach the philosophy of science with a focus on scientific practice and the practical uses of scientific knowledge. The SPSP conferences provide a broad forum for scholars committed to making detailed and systematic studies of scientific practices - neither dismissing concerns about truth and rationality, nor ignoring contextual and pragmatic factors. The conferences aim at cutting through traditional disciplinary barriers and developing novel approaches.

Keynote speakers: Karen Barad, University of California at Santa Cruz; Till Grüne-Yanoff, Royal Institute of Technology (KTH) Stockholm.

The International Conferences on Conceptual Structures (ICCS) focus on the formal analysis and representation of conceptual knowledge, at the crossroads of artificial intelligence, human cognition, computational linguistics, and related areas of computer science and cognitive science. The ICCS conferences evolved from a series of seven annual workshops on conceptual graphs, starting with an informal gathering hosted by John F. Sowa in 1986. Recently, graph-based knowledge representation and reasoning (KRR) paradigms are getting more and more attention. With the rise of quasi-autonomous AI, graph-based representations provide a vehicle for making machine cognition explicit to its human users. This year ICCS 2020 is a part of 'Bolzano Summer of Knowledge' which will take place in Bolzano, Italy during the month of September, 2020.

In view of the present circumstances around the COVID-19 epidemic, the ICSS conference will happen as an online event.

*Formal Methods in Mathematics / Lean Together 2020* will run from Monday, January 6 to Friday, January 10, 2020 at Carnegie Mellon University, in Pittsburgh, Pennsylvania. The meeting is a successor to Lean Together 2019.

The first three days will focus on formal methods in pure and applied mathematics, including interactive theorem proving, automated reasoning, verification of symbolic and numeric computation, and general mathematical infrastructure. The last two days will be devoted to specifically to the Lean Theorem Prover and its core library, mathlib. Users and library developers will have opportunities to present work in progress and discuss plans for the future.

Attendance is free and open to the public, but we ask you to let us know by December 6 if you plan to come.

This meeting aims to bring together young researchers interested in model theory. It will feature a mini-course, invited talks by established academics, and contributed talks by postgraduate researchers. Accommodation will be provided for a limited number of participants. Supported by LMS, University of Leeds, and the British Logic Colloquium.

Kurt Gödel's unparalleled results in logic grant him a prominent place among logicians. Apart from extraordinary results in the theory of formal systems, he influenced research in set theory, non-classical logics, physical model of the universe, and in philosophy. The event is organised to commemorate the anniversaries (14 January) of the death of Kurt Gödel (Brno 1906 - Princeton 1978) as well as the birth of Alfred Tarski (Warsaw 1901 - Berkeley 1983); January 14 may thus be viewed as World Logic Day.

Computer Science Logic (CSL) is the annual conference of the European Association for Computer Science Logic (EACSL). It is an interdisciplinary conference, spanning across both basic and application oriented research in mathematical logic and computer science.

Kurt Gödel's unparalleled results in logic grant him a prominent place among logicians. Apart from extraordinary results in the theory of formal systems, he influenced research in set theory, non-classical logics, physical model of the universe, and in philosophy. The event is organised to commemorate the anniversaries (14 January) of the death of Kurt Gödel (Brno 1906 - Princeton 1978) as well as the birth of Alfred Tarski (Warsaw 1901 - Berkeley 1983); January 14 may thus be viewed as World Logic Day.

Computer Science Logic (CSL) is the annual conference of the European Association for Computer Science Logic (EACSL). It is an interdisciplinary conference, spanning across both basic and application oriented research in mathematical logic and computer science.

The IEEE World Congress on Computational Intelligence (IEEE WCCI) is the world’s largest technical event in the field of computational intelligence. WCCI 2020 features the flagship conference of the Computational Intelligence Society: The 2020 International Joint Conference on Neural Networks (IJCNN 2020), the 2020 IEEE International Conference on Fuzzy Systems (FUZZ-IEEE 2020), and the 2020 IEEE Congress on Evolutionary Computation (IEEE CEC 2020) under one roof. It encourages cross-fertilisation of ideas among the three big areas and provides a forum for intellectuals from all over the world to discuss and present their research findings on computational intelligence.

Due to the Coronavirus outbreak, the workhop is cancelled!

Around thirty years after the fall of Hilbert's program, the proofs-as-programs paradigm established the view that proofs should consist in computational or epistemic objects conveying evidence to mathematical propositions. The relationship between formal derivations and proofs should then be analogous to the one between words and their meanings. This view naturally gives rise to questions such as 'which conditions should a formal arrangement of symbols satisfy to represent a proof?' or 'when do two formal derivations represent the same proof?'. These questions underlie past and current research in proof theory both in the theoretical computer science community (e.g. categorical logic, domain theory, linear logic) and in the philosophy community (e.g. proof-theoretic semantics).

In spite of these common motivations and historical roots, it seems that today proof theorists in philosophy and in computer science are losing sight of each other. This workshop aims at contributing to a renaissance of the interaction between researchers with different backgrounds by establishing a constructive environment for exchanging views, problems and results.

In addition to regular invited talks, the workshop includes two tutorials, aimed at introducing recent ideas on the correspondence between proofs, programs and categories as well as to the historical and philosophical aspects of the notions of infinity and predicativity.

Computer Science Logic (CSL) is the annual conference of the European Association for Computer Science Logic (EACSL). It is an interdisciplinary conference, spanning across both basic and application oriented research in mathematical logic and computer science.

IJCAR is the premier international joint conference on all topics in automated reasoning. It is the merger of leading events in automated reasoning: CADE (Conference on Automated Deduction), FroCoS (Symposium on Frontiers of Combining Systems), ITP (International Conference on Interactive Theorem Proving) and TABLEAUX (Conference on Analytic Tableaux and Related Methods). JCAR 2020 will be co-located with the conference FSCDThe IJCAR 2020 technical program will consist of presentations of high-quality original research papers, short papers describing interesting work in progress, system descriptions, and invited talks.

Woody Bledsoe Travel Awards will be available to support selected students attending the conference.

Computer Science Logic (CSL) is the annual conference of the European Association for Computer Science Logic (EACSL). It is an interdisciplinary conference, spanning across both basic and application oriented research in mathematical logic and computer science.

CiE 2020 is the 16th conference organized by CiE (Computability in Europe), a European association of mathematicians, logicians, computer scientists, philosophers, physicists and others interested in new developments in computability and their underlying significance for the real world.

The CiE conferences serve as an interdisciplinary forum for research in all aspects of computability, foundations of computer science, logic, and theoretical computer science, as well as the interplay of these areas with practical issues in computer science and with other disciplines such as biology, mathematics, philosophy, or physics.

Due to the current medical situation related to the coronavirus COVID-19 outbreak, the Organizing Committee of CiE2020, in agreement with the CiE Steering Committee, has decided to hold the conference virtually, without a physical gathering. The organizers are committed to recreate the usual CiE climate under the new conditions.

There will be two keynote speakers and six talks from graduate students on a variety of topics in the Philosophy of Mathematics and Logic, broadly construed. The graduate papers will have respondents, and the talks will be followed by open discussion. Our keynote speakers for this year are Lavinia Picollo (UCL) and Agustín Rayo (MIT).

Keynote speakers: Gisele Secco (Univ. Federal de Santa Maria, Brasil), Jemma Lorenat (Pitzer College, USA), Øystein Linnebo (Univ. of Oslo, Norway), Jeremy Avigad (Carnegie Mellon University, USA), Vincenzo De Risi (Laboratoire SPHère, CNRS-Univ. Paris 7, France).

There will be two keynote speakers and six talks from graduate students on a variety of topics in the Philosophy of Mathematics and Logic, broadly construed. The graduate papers will have respondents, and the talks will be followed by open discussion. Our keynote speakers for this year are Lavinia Picollo (UCL) and Agustín Rayo (MIT).

Keynote speakers: Gisele Secco (Univ. Federal de Santa Maria, Brasil), Jemma Lorenat (Pitzer College, USA), Øystein Linnebo (Univ. of Oslo, Norway), Jeremy Avigad (Carnegie Mellon University, USA), Vincenzo De Risi (Laboratoire SPHère, CNRS-Univ. Paris 7, France).

“PhDs in Logic” is an annual graduate conference organized by graduate students. This interdisciplinary conference welcomes contributions to various topics in mathematical logic, philosophical logic, and logic in computer science. It involves tutorials by established researchers as well as short (20-25 minutes) presentations by PhD students, master students and first-year postdocs on their research.
The 12th edition of “PhDs in Logic” will take place at the Freie Universität Berlin, Germany, from April 27 to 29, 2020.

We welcome students to participate in PhDs in Logic XII regardless of whether they want to submit a contribution. Students interested in participating, even without giving a talk, are kindly asked to register.

Due to efforts to restrain the spreading of the Corona Virus, all public events at all Berlin Universities have been cancelled until the 20th of July 2020. When the situation has sufficiently cleared an alternative date will be selected.

The TYPES meetings are a forum to present new and ongoing work in all aspects of type theory and its applications, especially in formalised and computer assisted reasoning and computer programming. The ITRS 2020 workshop aims to bring together researchers working on both the theory and practical applications of systems based on intersection types and related approaches. Part of the program is organised under the auspices of EUTypes.

Invited speakers: Ulrik Buchholtz, Pierre Marie-Pédrot, Leonardo de Moura and Sara Negri.

Intersection types were introduced near the end of the 1970s to overcome the limitations of Curry's type assignment system and to provide a characterization of the strongly normalizing terms of the Lambda Calculus.

Although intersection types were initially intended for use in analyzing and/or synthesizing lambda models as well as in analyzing normalization properties, over the last twenty years the scope of the research on intersection types and related systems has broadened in many directions.

The ITRS 2020 workshop aims to bring together researchers working on both the theory and practical applications of systems based on intersection types and related approaches. ITRS workshops have been held every two years.

Keynote speakers: Gisele Secco (Univ. Federal de Santa Maria, Brasil), Jemma Lorenat (Pitzer College, USA), Øystein Linnebo (Univ. of Oslo, Norway), Jeremy Avigad (Carnegie Mellon University, USA), Vincenzo De Risi (Laboratoire SPHère, CNRS-Univ. Paris 7, France).

Digital curation is a complex time and knowledge intensive process, in which knowledge workers create new content artifacts and knowledge insights from heterogeneous sources (content, data, knowledge). The work required for this includes, e.g., selecting, summarizing, scheduling, translating, localising, structuring, condensing, enriching, visualizing and explaining the various contents, from sources such as online newspapers, news portals, social media, linked data, business information systems, IoT data streams etc. AI, in particular from the field of language and semantic knowledge technologies, are used to support these tasks and thereby accelerate and qualitatively improve them.

The conference provides a forum on the use of digital curation technologies in application domains for, e.g., media, journalism, logistics, cultural heritage, health care and life sciences, energy, industry. Of particular relevance are papers that demonstrate the applied use of digital curation technologies and tools in domain-specific use cases and that bridge traditional boundaries between disciplines such as Artificial Intelligence and Semantic Web, data analytics and machine learning, information/content and knowledge management systems, information retrieval, knowledge discovery, and computational linguistics.

Keynote speakers: Gisele Secco (Univ. Federal de Santa Maria, Brasil), Jemma Lorenat (Pitzer College, USA), Øystein Linnebo (Univ. of Oslo, Norway), Jeremy Avigad (Carnegie Mellon University, USA), Vincenzo De Risi (Laboratoire SPHère, CNRS-Univ. Paris 7, France).

Digital curation is a complex time and knowledge intensive process, in which knowledge workers create new content artifacts and knowledge insights from heterogeneous sources (content, data, knowledge). The work required for this includes, e.g., selecting, summarizing, scheduling, translating, localising, structuring, condensing, enriching, visualizing and explaining the various contents, from sources such as online newspapers, news portals, social media, linked data, business information systems, IoT data streams etc. AI, in particular from the field of language and semantic knowledge technologies, are used to support these tasks and thereby accelerate and qualitatively improve them.

The conference provides a forum on the use of digital curation technologies in application domains for, e.g., media, journalism, logistics, cultural heritage, health care and life sciences, energy, industry. Of particular relevance are papers that demonstrate the applied use of digital curation technologies and tools in domain-specific use cases and that bridge traditional boundaries between disciplines such as Artificial Intelligence and Semantic Web, data analytics and machine learning, information/content and knowledge management systems, information retrieval, knowledge discovery, and computational linguistics.

The ILLC Colloquium is a half-yearly festive event (either the New Year's Colloquium, the Midsummernight Colloquium or the Midwinter Colloquium) that brings together the three research groups at the ILLC. Each colloquium consists of three main talks by representatives from the Logic and Language group, the Language and Computation group and the Logic and Computation group, which are occasionally followed by Wild Idea Talks. The colloquium is concluded by a get together of the entire ILLC community.

Diagrams 2020 is the eleventh conference in the biennial series that started in 2000. The multidisciplinary nature of Diagrams means it encompasses: architecture, art, artificial intelligence, biology, cartography, cognitive science, computer science, education, graphic design, history of science, human-computer interaction, linguistics, logic, mathematics, philosophy, psychology, and software modelling. The conference attracts a large number of researchers from these interrelated fields, positioning Diagrams as the major international event in the area.

Unfortunately, due to the ongoing Covid-19 pandemic, the physical conference in Estonia will not take place. Instead of a physical meeting, the Steering Committee have agreed that Diagrams 2020 will be held virtually through online talks.

Knowledge Representation and Reasoning (KRR) is an exciting, well-established field of research. In KRR a fundamental assumption is that an agent's knowledge is explicitly represented in a declarative form, suitable for processing by dedicated reasoning engines. This assumption, that much of what an agent deals with is knowledge-based, is common in many modern intelligent systems. In recent years KRR has contributed to new and emerging fields including the semantic web, computational biology, and the development of software agents. The biennial International Conference on the Principles of Knowledge Representation and Reasoning (KR) is a leading forum for timely, in-depth presentation of progress in the theory and principles underlying the representation and computational management of knowledge.

Due to the latest developments in Greece with the COVID19 pandemic, the hybrid format (physical and virtual participation) that was planned for KR2020 in September has been canceled. The new format, and possibly new dates, for KR2020 will be announced shortly.

Taking place once to twice per year at changing places, the DRMTA gives a joint institution for the researchers in model theory and its applications from the upper German language area. Talks are delivered by international guests and young scientists. The participation is open to anyone and free of charge.

Speakers: Arthur Forey (ETH Zürich), Lothar Sebastian Krapp (Universität Konstanz), Simon Müller (Universität Konstanz), Daniel Palacín(Albert-Ludwigs-Universität Freiburg) and Harry Schmidt (Universität Basel).

Today's IT systems, and the interactions between them, become increasingly complex. Power grid blackouts, airplane crashes, failures of medical devices and malfunctioning automotive systems are just a few examples of incidents that affect system safety. They are often due to component failures and unexpected interactions of subsystems under conditions that have not been anticipated during system design and testing. Determining the root cause(s) of a system-level failure and elucidating the exact scenario that led to the failure is today a complex and tedious task that requires significant expertise. Formal approaches for automated causality analysis, fault localization, explanation of events, accountability and blaming have been proposed independently by several communities - in particular, AI, concurrency, model-based diagnosis, software engineering, security engineering and formal methods. Work on these topics has significantly gained speed during the last years.

The goals of this workshop are to bring together and foster exchange between researchers from the different communities, and to present and discuss recent advances and new ideas in the field.

Argumentation and exchange of information help groups to coordinate, deliberate and decide. On the other hand, debates often generate detrimental large-scale phenomena such as polarization, informational cascades and echo-chambers, where the behavior of entire groups shifts in seemingly irrational ways.

Understanding the deep mechanisms of informational and social influence that underlie these phenomena in the age of social media is a challenge that engages methods from different disciplines, including philosophy, artificial intelligence, computer and social sciences and psychology.

This workshop brings together scholars with different theoretical approaches. Its broader aim is to foster an interdisciplinary understanding of the mechanisms that determine the behavior of individuals in a social context from multiple perspectives. The workshop will last two and a half days. The first half-day of it will be dedicated to an introductory seminar on abstract argumentation, held by Professor Pietro Baroni (Brescia).

Due to the spreading of COVID-19, this workshop will be held online as a video-conference-only.

A conference to celebrate Hans Peters' contributions to social choice and game theory, on the occasion of his retirement.

Cryptography forms the underlying basis for many security solutions in today's computer systems and networks, securing data while it is being stored, transferred, and processed. As security and privacy problems increase in real-world applications with emerging threats, new and innovative cryptography solutions are needed in order to ensure our computer systems and networks are protected.

This Special Issue will specifically focus on new and innovative cryptography solutions aiming to address emerging threats and existing threats in more efficient manner. The particular topics of interest for this Special Issue include, but are not limited to, the following:
- Foundational theory and mathematics for emerging computer systems and networks
- Provable security of emerging techniques for cryptography
- The proposal and analysis of cryptographic primitives for emerging computer systems and networks
- Cryptanalytic attacks on emerging computer systems and networks
- Cryptographic applications in cloud computing and IoT

Research articles, review articles as well as short communications are invited. Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website.

Reasoning is at the very heart of logic, constituting its subject matter. In the last few decades, there has been considerable progress both in the purely logical analysis of reasoning and in applied logical investigations of various concrete subject domains, such as philosophical and scientific discourse, logic programming and everyday communication. Along with further elaboration of standard techniques a range of other approaches and semantic modeling of logical systems are being developed. Moreover, there is a powerful tradition of analyzing and evaluating reasoning patterns by means of informal logic and argumentation theory. The aim of the conference is to bring together scholars working in various areas of proof-theoretic, semantic, argumentative and informal logic analysis.

Invited Speakers: Hans van Ditmarsch (French National Centre for Scientific Research, France), Valentin Goranko (Stockholm University, Sweden), Dale Hample (University of Maryland, USA) and Hitoshi Omori (Ruhr-University Bochum, Germany).

Due to the continuing coronavirus pandemic, the event in May 2021 has been suspended, but the organizers hope to hold the conference in Kyiv as soon as circumstances permit, as well as hold the regular conference in May 2022.

We are in the reality of natural and computational systems of argumentation provided by reasoning, with natural and artificial languages. Intelligent systems of argumentation target advanced methods for exchanging, saving, reasoning, accessing, and updating information in memory. There will be a Special Session on Natural Language and Argumentation 2020 (NLA'20) at DCAI'20, the 17th International Conference on Distributed Computing and Artificial Intelligence. This special session will cover both theories and applications.

A conference to celebrate Hans Peters' contributions to social choice and game theory, on the occasion of his retirement.