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===Principle of non-contradiction=== [[File:Aristoteles Louvre.jpg|thumb|upright|[[Bust (sculpture)|Portrait bust]] of Aristotle; an [[Roman Empire|Imperial Roman]] copy of a lost [[bronze sculpture]] made by [[Lysippos]]]] {{Main|Law of noncontradiction}} According to [[Aristotle]], "It is impossible for the same thing to belong and not to belong at the same time to the same thing and in the same respect."<ref>[https://plato.stanford.edu/entries/aristotle-noncontradiction/ "Aristotle on Non-contradiction."] {{Webarchive|url=https://web.archive.org/web/20180611021813/https://plato.stanford.edu/entries/aristotle-noncontradiction/ |date=2018-06-11 }} ''Stanford Encyclopedia of Philosophy''. 12 June 2015. 25 October 2017.</ref> For example, it is not possible that in exactly the same moment and place, it rains and does not rain.<ref>[https://oregonstate.edu/instruct/phl201/modules/Philosophers/Aristotle/aristotle_laws_of_thought.html "Great Philosophers."] ''Oregon State University''. 2002. 25 October 2017.</ref>
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