<abstract xmlns="http://www.w3.org/1999/xhtml">

After Poland gained independence in 1918, logic developed very quickly both as a scientific direction and as a taught discipline. This introduction to the special issue “Logic in Poland in the 20th Century,” published in Volume 13:1 (2024) and Volume 13:2 (2024), provides the historical context for the development of logic in the interwar period.
</abstract>

University of Information Technology and Management in Rzeszow

Logic in Poland in the 20th Century

<abstract xmlns="http://www.w3.org/1999/xhtml">

In this paper, we want to present the genesis of Stanisław Leśniewski’s mereology. Although ‘mereology’ comes from theword ‘part’, mereology arose as a theory of collective classes. That is why we present the differences between the concepts of <italic>being a distributive class</italic> and <italic>being a collective class</italic>. Next, we present Leśniewski’s original mereology from 1927, but with a modern approach. Leśniewski was inspired to create his concept of classes and their elements by Russell’s antinomy. To face it, Leśniewski had to define the concept of <italic>being an element of</italic> based on the concept of <italic>being part of</italic>. Leśniewski showed that in his theory, there is no equivalent to Russell’s antinomy. We will show that his solution has nothing to do with the original approach because, in both cases, we are talking about objects of a different kind. Russell’s original antinomy concerned distributive classes, and Leśsniewski’s considerations concerned collective classes.
</abstract>

From the History of Leśniewski’s Mereology

<abstract xmlns="http://www.w3.org/1999/xhtml">

The Warsaw School of Logic (WSL) was the famous branch of the Lviv-Warsaw School (LWS) – the most important movement in the history of Polish philosophy. Logic made the most important field in the activities of the WSL. The aim of this work is to highlight the role and significance of the WSL in the history of logic in the 20th century.
</abstract>

The Warsaw School of Logic: Main Pillars, Ideas, Significance

<abstract xmlns="http://www.w3.org/1999/xhtml">

The aim of this paper is to describe the history of logical investigations at the University of Poznań. The organisational structures within the discipline as well as the outstanding logicians and their achievements are presented. Connections with the Lviv–Warsaw School are indicated.
</abstract>

100 Years of Logical Investigations at the University of Poznań

<abstract xmlns="http://www.w3.org/1999/xhtml">

This paper briefly discusses the relations between logic and metalogic in history. Metalogic is understood as a reflection on logic in its various senses, particularly <italic>sensu stricto</italic> (formal, mathematical) and <italic>sensu largo</italic> (formal logic plus semantic plus methodology of science). It is shown that metalogic in its contemporary understanding arose after mathematical logic had become a mature discipline. Special passage is devoted to metalogic in Poland. The last part of the paper discussed so-called logocentric predicament.
</abstract>

Logic and Metalogic: a Historical Sketch

<abstract xmlns="http://www.w3.org/1999/xhtml">

As shown in (Łukowski, 2013), the paradox of the stone is a failed attempt to show that “omnipotence” is a contradictory concept. An element of the argument presented there is that God, while unable to lift the stone, can nevertheless annihilate it. This work considers the amplification of the paradox of the stone to the form generated by the question: can God create a stone which He will not be able to lift, nor, once created, will He be able to destroy.
</abstract>

Proof of the Existence of Hell: An Extension of the Stone Paradox

AHEAD OF PRINT

Volume 13 (2024): Issue 3 (May 2024) Special issue title: Logic and Law

Volume 13 (2024): Issue 2 (April 2024) Special issue title: Logic in Poland in the 20th Century

Volume 13 (2024): Issue 1 (April 2024) Special issue title: Logic in Poland in the 20th Century

Volume 12 (2023): Issue 4 (December 2023)

Volume 12 (2023): Issue 3 (April 2023) Indian Philosophy

Volume 12 (2023): Issue 1-2 (March 2023) Indian Logic

Volume 11 (2022): Issue 3-4 (December 2022)

Volume 11 (2022): Issue 2 (June 2022)

Volume 11 (2022): Issue 1 (March 2022)

Volume 10 (2021): Issue 4 (December 2021)

Volume 10 (2021): Issue 3 (June 2021) Humanistic Economy

Volume 10 (2021): Issue 2 (May 2021) Humanistic Economy

Volume 10 (2021): Issue 1 (February 2021)

Volume 9 (2020): Issue 3-4 (October 2020)

Volume 9 (2020): Issue 2 (July 2020) Libertarianism from the Philosophical Perspective

Volume 9 (2020): Issue 1 (March 2020)

Volume 8 (2019): Issue 4 (December 2019)

Volume 8 (2019): Issue 3 (October 2019)

Volume 8 (2019): Issue 2 (June 2019)

Volume 8 (2019): Issue 1 (February 2019)

Volume 7 (2018): Issue 4 (December 2018)

Volume 7 (2018): Issue 3 (September 2018)

Volume 7 (2018): Issue 2 (June 2018)

Volume 7 (2018): Issue 1 (March 2018)

Volume 6 (2017): Issue 4 (October 2017)

Volume 6 (2017): Issue 3 (July 2017)

Volume 6 (2017): Issue 2 (June 2017)

Volume 6 (2017): Issue 1 (March 2017)

Volume 5 (2016): Issue 4 (December 2016)

Volume 5 (2016): Issue 3 (September 2016)

Volume 5 (2016): Issue 2 (June 2016)

Volume 5 (2016): Issue 1 (March 2016)

Volume 4 (2015): Issue 4 (December 2015)

Volume 4 (2015): Issue 3 (July 2015)

Volume 4 (2015): Issue 2 (June 2015)

Volume 4 (2015): Issue 1 (February 2015)

Volume 3 (2014): Issue 4 (December 2014)

Volume 3 (2014): Issue 3 (September 2014)

Volume 3 (2014): Issue 2 (June 2014)

Volume 3 (2014): Issue 1 (February 2014)

Studia Humana

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Volume 13 (2024): Issue 1 (April 2024) - Special issue title: Logic in Poland in the 20th Century

Special issue title: Logic in Poland in the 20th Century

Volume 13 (2024): Issue 1 (April 2024)