Alfred Tarski

Jan Łukasiewicz – Multivalued Logic and Polish Notation

Jan Łukasiewicz – Multivalued Logic and Polish Notation

On December 21, 1878, Polish logician and philosopher Jan Łukasiewicz was born. His work centered on philosophical logic, mathematical logic, and history of logic. However, he is best known for Polish notation and Łukasiewicz logic. Jan Łukasiewicz – Youth and Education Łukasiewicz grew up in Lwów and was the only child of Paweł Łukasiewicz, a captain in the Austrian army, and Leopoldina, née Holtzer, the daughter of a civil servant. He finished his gymnasium studies…
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Alfred Tarski and the Undefinability of Truth

Alfred Tarski and the Undefinability of Truth

On January 14, 1902, Polish-American mathematician and logician Alfred Tarski was born. A prolific author he is best known for his work on model theory, metamathematics, and algebraic logic, he also contributed to abstract algebra, topology, geometry, measure theory, mathematical logic, set theory, and analytic philosophy. For my Semantic Web Technologies lecture series I always introduce my students to model-theoretic semantics as means to enable a formal representation of meaning for languages. I…
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Rudolf Carnap and the Logical Structure of the World

Rudolf Carnap and the Logical Structure of the World

On May 18, 1891, German-born philosopher Rudolf Carnap was born. He was a major member of the Vienna Circle and an advocate of logical positivism and made significant contributions to logic and the philosophy of science. To avoid the ambiguities resulting from the use of ordinary language, he made a logical analysis of language. He believed in studying philosophical issues in artificial languages constructed under the rules of logic and mathematics, which…
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