Joseph Gerard Brennan's A handbook of logic PDF

By Joseph Gerard Brennan

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Original A. All galagos are pessimists. E. No members of the library committee are members of the social committee. 1. Some artists are bohemIans. Obverted Converse Some pessimists are not nongalagos. All members of the social committee are nonmembers of the lihrary committee. Some bohemians are not nonartists. ARE INFERENCES FROM GENERAL TO PARTICULAR VALID? We know that it is formally invalid to infer a general proposition from a particular. " But what about the other way around? " But if the modern doctrine of the nonexistential import of general propositions holds (see p.

Logic examples are tiresome. Those things which cannot properly be called tiresome cannot properly be called logic examples. I I. I love you. You love me. 12 . Not an aardvark was stirring. At least one aardvark was stirring. 13. All stenographers sing. Some nonsingers are not stenographers. 14. Pigs are charming. Some noncharming things are nonpigs. 15. Some grasshoppers eat their husbands. Some who eat their husbands are not non grasshoppers. 16. No Fuller Brush men are Good Humor men. Some non-Fuller Brush men are not non-Good Humor men.

Some teachers are wise. O. Some phosphorus is not inflammable. Obverse No poets are nonpractical. All idiots are nonresponsible. Some teachers are not non wise. Some phosphorus is noninflammable. PARTIAL CONTRAPOSITION Partial contrapositions of propositions may be obtained by (I) getting the obverse of the original proposition, then (2) obtaining the converse of the result. In other words, a partial contraposition is the converse of an obverse. Original A. All airplane mechanics are employed. E.

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A handbook of logic by Joseph Gerard Brennan

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