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Studies and Exercises in Formal Logic: Including a Generalisation of Logical ...
John Neville Keynes
Uten tilgangsbegrensning - 1884
ABCD absent according admit affirmative alternatives angles appears apply assertion attributes called categorical CHAPTER combination Compare complex conclusion connotation contained contradictory contrapositive contrary conversion definition denoted deny discussed disjunctive distinction distributed equal equivalent Everything example excluded existence expressed fact false Figure Formal further given gives happy hypothetical immediate inference implies individual inference Inverse involved Jevons kind latter limited Logic logicians major premiss means method Mill minor moods nature negative not-P not-S obtained obversion opposition ordinary original proposition particular position possible predicate premisses present problem Professor proposition prove question reasoning reduced reference regard relation respectively result rule sense shew shewn simple singular sometimes statement Studies syllogism symbols taken term thing thought tion true truth universal valid whole
Side 269 - My cousin Westmoreland ! No, my fair cousin : If we are mark'd to die, we are enow To do our country loss ; and if to live, The fewer men, the greater share of honour.
Side 241 - If A is B, C is D ; and if E is F, G is H ; But either C is not D, or G is not H ; Therefore either A is not B, or E is not F.
Side 352 - That wherever the properties A and B are both absent, the properties C and D are both absent also; and vice versa, where the properties C and D are both absent, A and B are both absent also. Let it then be required from the above to determine what may be concluded in any particular instance from the presence of the property A with respect to the presence or absence of the properties B and (7, paying no regard to the property D.
Side 266 - For those who are bent on cultivating their minds by diligent study, the incitement of academical honours is unnecessary; and it is ineffectual, for the idle, and such as are indifferent to mental improvement: therefore the incitement of academical honours is either unnecessary or ineffectual.
Side 250 - What worst relation of subject and predicate, subsists between either of two terms and a common third term, with which one, at least, is positively related ; — that relation subsists between the two terms themselves...
Side 265 - Testimony is a kind of evidence which is very likely to be false : the evidence on which most men believe that there are pyramids in Egypt is testimony : therefore the evidence on which most men believe that there are pyramids in Egypt is very likely to ba false.
Side iii - Fcap. 8vo. 31. 6d. THE PRINCIPLES OF SCIENCE. A Treatise on Logic and Scientific Method. New and Revised Edition. Crown 8vo. 12s. 6d. STUDIES IN DEDUCTIVE LOGIC. Second Edition. Crown 8vo. 6s. Keynes. — FORMAL LOGIC, Studies and Exercises in. Including a Generalisation of Logical Processes in their application to Complex Inferences. By JOHN NEVILLE KEYNES, MA, late Fellow of Pembroke College, Cambridge.