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Jan Łukasiewicz

mathematics
Jan Łukasiewicz – Multivalued Logic and Polish Notation

Jan Łukasiewicz – Multivalued Logic and Polish Notation

Harald Sack
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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mathematics
Alfred Tarski and the Undefinability of Truth

Alfred Tarski and the Undefinability of Truth

Harald Sack
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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computer science
Do You Speak Polish… Or Maybe Reverse Polish?

Do You Speak Polish… Or Maybe Reverse Polish?

Harald Sack
I guess almost nobody except a few mathematicians and computer scientists have ever heard of the Australian computer scientist Charles Leonard Hamblin, who passed away on May 14, 1985. And also most of my fellow computer scientists might not have heard of him. But, one of his major contributions to computer science was the introduction of the so-called Reverse Polish Notation. Does that ring a bell? Charles Leonard Hamblin – Early Years…
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