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Deductive Logic

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Author: St George Stock
Published: 1888
Language: English
Wordcount: 71,934 / 234 pg
Flesch-Kincaid Reading Ease: 69.5
LoC Category: BC
Downloads: 1,601
mnybks.net#: 6685
Origin: gutenberg.org
Genre: Non-fiction
Excerpt

t; 27. If it were possible for the law of identity to be violated, no violation of the law of contradiction would necessarily ensue: for a thing might then be something else, without being itself at the same time, which latter is what the law of contradiction militates against. Neither would the law of excluded middle be infringed. For, on the supposition, a thing would be something else, whereas all that the law of excluded middle demands is that it should either be itself or not. A would in this case adopt the alternative of being not A.

§ 28. Again, the violation of the law of contradiction does not involve any violation of the law of identity: for a thing might in that case be still itself, so that the law of identity would be observed, even though, owing to the law of contradiction not holding, it were not itself at the same time. Neither would the law of excluded middle be infringed. For a thing would, on the supposition, be both itself and not itself, which is the very reverse of being neit

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