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As the study of argument is of clear importance to the reasons that we hold things to be true, [[logic]] is of essential importance to [[rationality]]. [[Argument]]s may be logical if they are "conducted or assessed according to strict principles of [[Validity (logic)|validity]]",<ref>[[Oxford Dictionary of English]], sense 1 of logic.</ref> while they are rational according to the broader requirement that they are based on [[reason]] and [[knowledge]].
Logic and rationality have each been taken as fundamental concepts in [[philosophy]]. They are not one of the same thing. Philosophical [[rationalism]] in its most extreme form is the doctrine that knowledge can ultimately be founded on pure reason, while [[logicism]] is the doctrine that mathematical concepts, among others are reducible to pure logic.
==Forms of reasoning==
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