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Square of opposition (view source)

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==External links==

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~~{{commonscat|Square of opposition}}~~

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* [http://plato.stanford.edu/entries/square/ Stanford Encyclopedia of Philosophy article]

* [http://uk.geocities.com/frege@btinternet.com/opposition/opposition.htm Square of Opposition] page at the Logic Museum

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[[Category:Logic]]

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~~[[fr:Carré logique]]~~

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~~[[pt:Quadrado das oposições]]~~

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~~[[zh:对立四边形]]~~

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