Studies in Deductive Logic: A Manual for Students, by W. Stanley JevonsMacmillan and Company, limited, 1896 - 304 sider |
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Side xvii
... proving contradiction . I may not have sufficiently insisted upon the importance of this matter ; but the fact is that so long ago as 1864 ( see pp . 181 , 192 , of this book ) I pointed out the complete disappearance of a letter - term ...
... proving contradiction . I may not have sufficiently insisted upon the importance of this matter ; but the fact is that so long ago as 1864 ( see pp . 181 , 192 , of this book ) I pointed out the complete disappearance of a letter - term ...
Side xxi
... proved in Chapters VI . , VII . , XI . , XII . , and in other parts of the Principles of Science , that induction is the inverse operation of deduction , the supreme importance of syllogistic and other deductive reasoning is not so much ...
... proved in Chapters VI . , VII . , XI . , XII . , and in other parts of the Principles of Science , that induction is the inverse operation of deduction , the supreme importance of syllogistic and other deductive reasoning is not so much ...
Side 43
... The contrapositive , then , is the converse of the obverse . We may also prove the truth of the contrapositive indirectly ; for what is not - y must be either X or not - X ; but if it be X it is by the premise V 43 QUESTIONS AND ANSWERS.
... The contrapositive , then , is the converse of the obverse . We may also prove the truth of the contrapositive indirectly ; for what is not - y must be either X or not - X ; but if it be X it is by the premise V 43 QUESTIONS AND ANSWERS.
Side 54
... proved . 33. Can we ever convert a proposition of the form all As are Bs ' into one of the form all Bs are As ' ? Certainly we cannot infer that all Bs are As because all As are Bs . As a general rule the predicate of the con- vertend B ...
... proved . 33. Can we ever convert a proposition of the form all As are Bs ' into one of the form all Bs are As ' ? Certainly we cannot infer that all Bs are As because all As are Bs . As a general rule the predicate of the con- vertend B ...
Side 72
... prove a negative conclusion one of the premises must be negative . From the above rules may be deduced two subordinate rules , which it will nevertheless be convenient to state at once . ( 7 ) From two particular premises no conclusion ...
... prove a negative conclusion one of the premises must be negative . From the above rules may be deduced two subordinate rules , which it will nevertheless be convenient to state at once . ( 7 ) From two particular premises no conclusion ...
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Studies in Deductive Logic: A Manual for Students William Stanley Jevons Uten tilgangsbegrensning - 1880 |
Studies in Deductive Logic: A Manual for Students William Stanley Jevons Uten tilgangsbegrensning - 1880 |
Vanlige uttrykk og setninger
A. J. Ellis aBc abC abc ABCD ABCD ABCD angles animals assertion bipeds Camestres CHAPTER combinations conclusion concrete contain carbon contradictory contrapositive converse by limitation Crown 8vo crystals definitions devoid of carbon Elementary Lessons equal equation equivalent example existence express fallacy false falsity figure and mood following propositions Formal Logic fourth figure give Hamilton Hence Illicit Major Illicit Process implies inductive involve jests at scars Laws of Thought Lessons in Logic Logical Alphabet logical force logical relation logicians major premise major term material truth mathematical meaning metals middle term minor term Morgan mortal negative premises negative proposition non-disjunctive obverse possible Principles of Science problem Professor prove pseudo-mood qualities quantity question reasoning second figure singular student subaltern substances syllogistic symbols things third figure Thomson triangles true truly scientific author Undistributed Middle universal negative valid syllogism Xs are Ys
Populære avsnitt
Side 174 - For none of us liveth to himself, and no man dieth to himself. For whether we live, we live unto the Lord; and whether we die, we die unto the Lord : whether we live therefore, or die, we are the Lord's.
Side 244 - I do declare that no foreign prince, person, prelate, state, or potentate hath, or ought to have any jurisdiction, power, superiority, pre-eminence, or authority, ecclesiastical or spiritual, within this realm; so help me God.
Side 29 - To gild refined gold, to paint the lily, To throw a perfume on the violet, To smooth the ice, or add another hue Unto the rainbow, or with taper-light To seek the beauteous eye of heaven to garnish, Is wasteful, and ridiculous excess.
Side 78 - Which of you convinceth me of sin ? And if I say the truth, why do ye not believe me? He that is of God heareth God's words : ye therefore hear them not, because ye are not of God.
Side 82 - Now these things were our examples, to the intent we should not lust after evil things, as they also lusted.
Side 29 - All places that the eye of heaven visits Are to a wise man ports and happy havens. Teach thy necessity to reason thus ; There is no virtue like necessity.
Side 61 - If a straight line meet two straight lines, so as to make the two interior angles on the same side of it taken together less than two right angles...
Side 73 - Barbara, Celarent, Darii, Ferioque, prioris ; Cesare, Camestres, Festino, Baroko, secundae ; Tertia, Darapti, Disamis, Datisi, Felapton, Bokardo, Ferison, habet ; Quarta insuper addit Bramantip, Camenes, Dimaris, Fesapo, Fresison.
Side 26 - Whosoever is delighted in solitude is either a wild beast or a god. For it is most true that a natural and secret hatred and aversation towards society in any man hath somewhat of the savage beast ; but it is most untrue that it should have any character at all of the divine nature except it proceed, not out of a pleasure in solitude, but out of a love and...