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A⥽(B⥽B)
تاربرگهای پیمودهشده در این نشست:
Some Theorems About the Sentential Calculi of Lewis and Heyting
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Jean Buridan
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lattice
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Kuratowski axiom set
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Logical-Historical Analysis of Gödel's Metatheorem in Modal Logic
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Jan Łukasiewicz