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'''Logic''', from the Greek λογικός (logikos) <ref>"possessed of reason, intellectual, dialectical, argumentative", also related to λόγος (logos), "word, thought, idea, argument, account, reason, or principle" (Liddell & Scott 1999; Online Etymology Dictionary 2001).</ref> is the study of [[reasoning]].<ref>{{cite book | url = http://books.google.com/books?id=KaAZAAAAMAAJ&pg=PA12&lpg=PA12&dq=%22art+and+science+of+reasoning%22 | title = A manual of logic | series = University tutorial series | volume = 1 | first = James | last = Welton | edition = 2nd | publisher = W.B. Clive | year = 1896}}</ref> Logic is used in most intellectual activity, but is studied primarily in the disciplines of [[philosophy]], [[mathematics]], and [[computer science]]. Logic examines general forms which [[argument]]s may take, which forms are valid, and which are fallacies. It is one kind of [[critical thinking]]. In philosophy, the study of logic falls in the area of [[epistemology]]: how do we know what we know. In mathematics, it is the study of valid [[inference]]s within some [[formal language]].<ref name=stanford-logic-onthology />
As a discipline, logic dates back to [[Aristotle]], who established its fundamental place in [[philosophy]]. The study of logic is part of the classical [[Trivium (education)|trivium]].
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