What is Law of noncontradiction?
The '''law of non-contradiction''' is a rule of [[logic]]. It states that if something is true, then the opposite of it is false. For example, if an animal is a cat, the same animal cannot be not a cat. Or, stated in logic, if +p, then not -p, +p cannot be -p at the same time and in the same sense. The law was stated as a principle of mathematical logic by [[Bertrand Russell|Russell]] and [[Alfred North Whitehead|Whitehead]] in ''[[Principia Mathematica]]''.<ref>Alfred North Whitehead, Bertrand Russell (1910), ''Principia Mathematica'', Cambridge, pp. 116–117</ref> [[Ravi Zacharias]] has said most eastern philosophies reject the law of noncontradiction.<ref>Zacharias, Ravi The Real Face of Atheism page 176</ref> The law of non-contradiction is found in ancient [[Indian logic]] as a rule in the ''[[Kalpa (Vedanga)|Shrauta Sutras]]'', the writing of [[:en:Pāṇini|Pāṇini]],<ref>{{citation|author=[[Frits Staal]]|title=Universals: Studies in Indian Logic and Linguistics|pages=109–28|year=1988|publisher=[[Chicago]]}} ([[cf.]] {{citation|last=Bull|first=Malcolm|title=Seeing Things Hidden|page=53|year=1999|publisher=Verso|isbn=1-85984-263-1}})</ref> and the ''[[Brahma Sutras]]'' attributed to [[Vyasa]]. It was later elaborated on by medieval commentators such as [[Madhvacharya]].<ref>{{citation|title=A History of Indian Philosophy|first=Surendranath|last=Dasgupta|publisher=[[Motilal Banarsidass]]|year=1991|isbn=81-208-0415-5|page=110}}</ref> The idea of noncontradiction is rejected in some strands of Buddhism. ==References== {{reflist}} == Other websites == *{{YouTube|JWVzHOhGSC0|Law of Non-Contradiction}} [[Category:Logic]]