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- Law_of_identity abstract "This article uses forms of logical notation. For a concise description of the symbols used in this notation, see List of logic symbols.In logic, the law of identity is the first of the three classical laws of thought. It states that: “each thing is the same with itself and different from another”: “A is A and not ~A”. By this it is meant that each thing (be it a universal or a particular) is composed of its own unique set of characteristic qualities or features, which the ancient Greeks called its essence. Consequently, things that have the same essence are the same thing, while things that have different essences are different things. In its symbolic representation:(“A is A”), the first element of the proposition represents the subject (thing) and the second element, the predicate (its essence), with the copula “is” signifying the relation of “identity”. Further, since a definition is an expression of the essence of that thing with which the linguistic term is associated, it follows that it is through its definition that the identity of a thing is established. For example, in the definitive proposition:"A lawyer is a person qualified and authorized to practice law", the subject (lawyer) and the predicate (person qualified and authorized to practice law) are declared to be one and the same thing (identical). Consequently, the Law of Identity prohibits us from rightfully calling anything other than "a person qualified and authorized to practice law" a "lawyer".In logical discourse, violations of the Law of Identity (LOI) result in the informal logical fallacy known as equivocation. That is to say, we cannot use the same term in the same discourse while having it signify different senses or meanings – even though the different meanings are conventionally prescribed to that term. In everyday language, violations of the LOI introduce ambiguity into the discourse, making it difficult to form an interpretation at the desired level of specificity.".
- Law_of_identity wikiPageID "1403190".
- Law_of_identity wikiPageRevisionID "602636566".
- Law_of_identity date "February 2014".
- Law_of_identity hasPhotoCollection Law_of_identity.
- Law_of_identity reason "Explain the meaning of '~'.".
- Law_of_identity subject Category:Classical_logic.
- Law_of_identity subject Category:Identity.
- Law_of_identity subject Category:Metaphysics.
- Law_of_identity subject Category:Theorems_in_propositional_logic.
- Law_of_identity type Abstraction100002137.
- Law_of_identity type Communication100033020.
- Law_of_identity type Message106598915.
- Law_of_identity type Proposition106750804.
- Law_of_identity type Statement106722453.
- Law_of_identity type Theorem106752293.
- Law_of_identity type TheoremsInPropositionalLogic.
- Law_of_identity comment "This article uses forms of logical notation. For a concise description of the symbols used in this notation, see List of logic symbols.In logic, the law of identity is the first of the three classical laws of thought. It states that: “each thing is the same with itself and different from another”: “A is A and not ~A”.".
- Law_of_identity label "Law of identity".
- Law_of_identity label "Principe d'identité".
- Law_of_identity label "Principio d'identità".
- Law_of_identity label "Principio de identidad".
- Law_of_identity label "Princípio da identidade".
- Law_of_identity label "Zasada tożsamości".
- Law_of_identity label "Закон тождества".
- Law_of_identity label "同一律".
- Law_of_identity label "同一性".
- Law_of_identity sameAs Ταυτότητα_(μαθηματικά).
- Law_of_identity sameAs Principio_de_identidad.
- Law_of_identity sameAs Principe_d'identité.
- Law_of_identity sameAs Principio_d'identità.
- Law_of_identity sameAs 同一性.
- Law_of_identity sameAs Zasada_tożsamości.
- Law_of_identity sameAs Princípio_da_identidade.
- Law_of_identity sameAs m.04zsgz.
- Law_of_identity sameAs Q2372261.
- Law_of_identity sameAs Q2372261.
- Law_of_identity sameAs Law_of_identity.
- Law_of_identity wasDerivedFrom Law_of_identity?oldid=602636566.
- Law_of_identity isPrimaryTopicOf Law_of_identity.