The 8th annual (International) Krasnoyarsk Logical Workshop, dedicated to the World Logic Day, was traditionally took place in a mixed format on January 14th.

What is special about January 14th?

• January 14 — (Old) New Year according to the Julian calendar;
• January 14, 1901 — the birthday of Alfred Tarski;
• January 14, 1978 — the day of the death of Kurt Gödel.

As in previous years, the workshop was held in a mixed format.

• Everyone were able to attend in person without prior registration in room 34-17 of the Institute of Mathematics and Computer Science of the Siberian Federal University (Krasnoyarsk, Svobodny ave., 79).
• Online participation was possible with pre-registration. The connection details are available only to registered participants.

Participation is open to everyone (including junior students).
Recall that the first workshop in support of Jean-Yves Béziau's initiative to recognize January 14 as World Logic Day took place in 2019. In 2020-22 it was held as an official event of the World Logic Day project of UNESCO through CIPSH (Conseil International de Philosophie et des Sciences Humaines):
2nd Krasnoyarsk Logical Workshop,
3rd Krasnoyarsk Logical Workshop,
4th Krasnoyarsk Logical Workshop.
The 5th Krasnoyarsk Logical Workshop became international.
The 6th and 7th Krasnoyarsk Logical Workshops retained this status.

The event was supported by the Department of Algebra and Mathematical Logic and the Krasnoyarsk Mathematical Center. Information and technical support for the event was traditionally provided by the IM&CS Youth Center.

Call for Contributions: Applications for participation with a report was accepted until January 13, 18:00 local time (UTC+7).

The workshop was feature presentations of both methodological and historical nature, as well as reports on new scientific results. A traditional coffee break, dedicated to the celebration of the Old New Year, was also take place.

The meeting was started at 16:00 local time (UTC+7). The final program with the list of speakers and talk titles is published here.

Organizing Committee:
Stepan I. Bashmakov (chairman), Kirill Smelykh, Elizaveta Brylyakova, Aleksandr Polyakov, Yulia Bushakova.

16:00 — the beginning of the meeting. Introductory speech by Stepan I. Bashmakov.

• 16:10 Sergei P. Odintsov (Institute of Mathematics of SB RAS, Novosibirsk) — On logical foundations of ASP (online);
• 16:45 Andrey V. Kudinov (Steklov Mathematical Institute of RAS, Moscow) — Logic of inequality: a simple example of modal logic without finite axiomatizability (online);
• 17:25 Lyuba Konova and Tinko Tinchev (Sofia University St. Kliment Ohridski, Bulgaria) — Four fragments of the first order theory of the Euclidean plane (online);
• 18:00 Ekaterina A. Kotikova and Mikhail N. Rybakov (MIPT, Tver State University, HSE University, Moscow) — Kripke incompleteness of first-order calculi with temporal modalities of CTL and ATL (online).

18:45 — virtual/real coffee break
19:00 — the second half of the meeting

• 19:00 Elizaveta V. Brylyakova (SibFU, Krasnoyarsk) — The n-characteristic model method for some extensions of Int and N3 (offline);
• 19:25 Aleksandr A. Polyakov (SibFU, Krasnoyarsk) — Projectivity vs. Nullarity of Unification in Alt_1 Logic (offline);
• 19:40 Kirill A. Smelykh (SibFU, Krasnoyarsk) — From Relational Semantics to Tree Automata for CTLK (offline);
• 20:00 Nikolay V. Shilov (A.P. Ershov Institute of Informatics Systems of SB RAS, Lyceum No. 22 "Hope of Siberia", Novosibirsk) — Why I Don't Trust Mathematicians (A Christmas Story) (online);
• 20:20 Dmitry M. Anishchenko (Novosibirsk State University, Novosibirsk) — Stone Duality for Boolean Algebras (online);
• 20:45 Julia A. Bushakova (SibFU, Krasnoyarsk) — Filtration method for non-classical logics (offline).

21:00 — the ending of the meeting.