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 Feb 2021

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 Oct 2020

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An Euler diagram (/ˈɔɪlər/, OYlər) is a diagrammatic means of representing sets and their relationships. They are particularly useful for explaining complex hierarchies and overlapping definitions. They are similar to another set diagramming technique, Venn diagrams. Unlike Venn diagrams, which show all possible relations between different sets, the Euler diagram shows only relevant relationships.


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Kuratowski definition of an ordered pair

 Jul 2020

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Willard Van Orman Quine insisted on classical, firstorder logic as the true logic, saying higherorder logic was "set theory in disguise".


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