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An Introduction to Logic (Second Edition) (1890) - download pdf or read online

By W. H. S. Monck

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IMMEDIATE INFERENCES CONTINUED. I enumerated the principal kinds of immediate inference, namely, Conversion, Subalterna- IN the last chapter tion, Obversion, appeal to and Opposition. All these inferences sense, and can hardly be established common * The contradictory is disproved by showing that the assumption of its truth would lead us to contradict the Fifth Proposition, which has already been proved. Contradiction is thus employed twice in the argument. An 24 otherwise ; Introduction to Logic.

Again, suppose the proposition had been Every animal with horns on the skull ruminates, we could write this in the form Every anirnal-withhorns-on-the-skull is a ruminant, which is of the same form as Every B is C. Sometimes a great number of words will enter into a single term in Logic. Thus, in the proposition The removal of the electoral disabilities B2 An 4 of women is Liberal party, " Introduction to Logic. a measure advocated by the advanced we must make a single term out of The removal - of- the- electoral- disabilities-of- women," - measure - advocated - by - the - advanced-Liberala single term and by this treatment party is likewise the above proposition takes the form B is C.

Though From Some men are not black, in like manner, you cannot infer No men are black. In fact there is a valuable general that rule applicable to all these inferences, viz. that you can not increase the quantity of a term (unless indeed you are inferring the falsehood instead of the truth of the proposition in which the term occurs with the larger For it is self-evident that something may be quantity) . true of a part, but not of the whole or of a different part An 28 Introduction to Logic. same whole and hence, whenever a term is parti cular in the original proposition it cannot be universal in the inference derived from it.

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An Introduction to Logic (Second Edition) (1890) by W. H. S. Monck


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