tetradic relation

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Tarski's axioms — Tarski s axioms, due to Alfred Tarski, are an axiom set for the substantial fragment of Euclidean geometry, called elementary, that is formulable in first order logic with identity, and requiring no set theory. Other modern axiomizations of… … Wikipedia
Romanian philosophy — is a name covering either a) the philosophy done in Romania or by Romanians, or b) an ethnic philosophy, which expresses at a high level the fundamental features of the Romanian spirituality, or which elevates to a philosophical level the… … Wikipedia
Semiotic elements and classes of signs — C. S. Peirce articles General: Charles Sanders Peirce Charles Sanders Peirce bibliography Philosophical: Categories (Peirce) Semiotic elements and classes of signs (Peirce) Pragmatic maxim • Pragmaticism… … Wikipedia
4 (number) — Four redirects here. For other uses, see 4 (disambiguation). 4 −1 0 1 2 3 4 5 6 7 8 9 → List of numbers Integers … Wikipedia

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