Stanisław Jaśkowski

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What Wikipedia says

Stanisław Jaśkowski (Polish pronunciation: [staˈɲsvaf jaɕˈkɔfskʲi]; 22 April 1906, in Warsaw – 16 November 1965, in Warsaw) was a Polish logician who made important contributions to proof theory and formal semantics. He was a student of Jan Łukasiewicz and a member of the Lwów–Warsaw School of Logic.

Excerpt from the Wikipedia article “Stanisław Jaśkowski”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Krzem Anonim, CC BY-SA 4.0, via Wikimedia Commons.