The Third World Logic Day will be celebrated all over the world on January 14, 2021, with a series of scientific events. The World Logic Day was organized for the first time on January 14, 2019. The date of January 14 is related to two of the most prominent logicians of the twentieth century. January 14, 1978, is the date of death of Kurt Gödel and January 14, 1901, is the date of birth of Alfred Tarski.

Based on the success of this First World Logic Day, on 26 November 2019, UNESCO proclaimed 14 January to be World Logic Day and included it in its list of International Days. The event is very popular worldwide. Last year there were 60 scientific events in 35 countries and this year 45 events in 27 countries have already been registered.

To mark the day the logicians from the Bulgarian Academy of Sciences and from Sofia University “St. Kliment Ohridski” have decided to organize a joint event on the occasion of the World Logic Day 2021. The event is included in the official program of the Third World Logic Day.

A joint meeting of the Seminar of Algebra and Logic of the Institute of Mathematics and Informatics at BAS, the Seminar of Mathematical Logic of the Faculty of Mathematics and Informatics of Sofia University “St. Kliment Ohridski”, and the Seminar of Logic of the Institute of Philosophy and Sociology at BAS has been organized.

The event will take place via Zoom on January 15, 2021 (Friday) from 9:30 am local time (UTC+2). Everybody is cordially invited to attend by following the link:

Time: Jan 15, 2021, 09:30 Sofia
Meeting ID: 840 0654 3603
Passcode: 116245

The programme is available here.

There will be 10 talks from the three scientific institutions. Since many scientific events are planned worldwide for January 14, the organizers of the joint seminar have decided to schedule the event for January 15, 2021.

Official guests of the joint seminar, who will participate at the opening ceremony, are:

  • Her Excellency Maria Edileuza Fontenele Reis, Ambassador of the Federative Republic of Brasil to the Republic of Bulgaria and the Republic of North Macedonia. As a former Ambassador of the Federative Republic of Brazil at UNESCO, she succeeded to include the World Logic Day in the UNESCO Calendar of International Days.
  • Karina Angelieva, Deputy Minister of Education and Science.
  • Acad. Julian Revalski, President of the Bulgarian Academy of Sciences.
  • Prof Anastas Gerdjikov, Rector of Sofia University “St. Kliment Ohridski”.

An official guest for the afternoon session of the event will be Prof. Jean-Yves Béziau, Creator of the World Logic Day and Editor-in-Chief of Logica Universalis.

The home page of the official World Welcome Celebration of January 14, 2021, is

The page contains also a pre-recorded video address by Her Excellency Maria Edileuza Fontenele Reis to the worldwide community
that everybody can watch on

Two of our colleagues, Alexandra Soskova and Valentin Goranko, are among the official guests of the ceremony.

Department of Algebra and Logic, IMI-BAS