## Formal Logic: Or, The Calculus of Inference, Necessary and ProbableTaylor and Walton, 1847 - 336 páginas |

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Formal Logic: Or, The Calculus of Inference, Necessary and Probable Augustus De Morgan Visualização completa - 1847 |

Formal Logic: Or, The Calculus of Inference, Necessary and Probable Augustus De Morgan Visualização completa - 1847 |

Formal Logic: Or, The Calculus of Inference, Necessary and Probable Augustus De Morgan Visualização completa - 1847 |

### Termos e frases comuns

abfolute affertion affirmative againſt alſo anſwer argument ball becauſe cafe caſe complex conclufion confequence confideration confidered contained contrary courſe deſcribed deſcription diſtinction diſtinguiſhed eaſily elſe eſtabliſhed exiſtence expreffed faid fallacy falſe fame fimple firft firſt fome fomething forms fpecies fubidentical fuch fuppofe fyftem fyllo fyllogifm fymbol genus give Hamilton himſelf idea ignoratio elenchi impoffible inference inftances itſelf juſt laſt leaſt leſs logic meaning meaſure middle term mode moſt muſt neceffarily neceffary neceſſary negative object particular perſon phraſe poffible pofition predicate premiſes preſent probability proceſs propofition publiſhed quantity queſtion reaſon refult repreſent reſpect rule ſame ſay ſcience ſecond ſee ſeems ſeen ſenſe ſeparate ſeveral ſhall ſhould ſhow Sir William Hamilton ſome ſpeak ſpecies ſpoken ſtand ſtate ſtatement ſtill ſtrengthened ſtudy ſubject ſuch ſuppoſe ſyſtem teftimony themſelves theſe thing thoſe tion true truth underſtood univerſal uſe uſually word Xs are Ys

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Página 266 - ... fcenes, he feems to produce without labour, what no labour can improve* In tragedy he is always ftruggling after fome occafion to be...

Página 205 - Organum. It is indeed an elaborate and correct analysis. But it is an analysis of that which we are all doing from morning to night, and which we continue to do even in our dreams.

Página 160 - By degree of probability we really mean, or ought to mean, degree of belief. It is true that we may, if we like, divide probability into ideal and objective, and that we must do so, in order to represent common language.

Página 161 - An omniscient being would never employ probable inferences, since every proposition would be known to be certainly true or certainly false. Beings lacking omniscience must rely on probabilities, since their knowledge is incomplete, and probability measures their ignorance. When we feel altogether...

Página 64 - A is greater than B, B is greater than C, therefore A is greater than C.

Página 15 - I would not dissuade a student from metaphysical inquiry ; on the contrary I would rather promote the desire of entering on such subjects ; but I would warn him, when he tries to look down his own throat with a candle in his hand, to take care that he does not set his own head on fire...

Página 111 - B, or if C is D, E is F ; But either A is B, or C is D ; /. E is F.

Página 225 - there is no such thing as a classification of the ways in which men may arrive at an error: it is much to be doubted whether there ever can be."* Surely, there can be no conclusive and comprehensive classification.

Página 316 - A it affirms of this, tJvese, all — Whilst E denies of any : I, it affirms, whilst 0 denies, Of some (or few or many). Thus A affirms, as E denies, And definitely either : Thus I affirms, as O denies, And definitely neither. A half, left semi-definite, Is worthy of its score ; U, then, affirms, as Y denies, This, neither less nor more.

Página 24 - ... Whately, understands by a Real Definition one which contains less than the Nominal Definition, provided only that what it contains is sufficient for distinction. "By real definition I mean such an explanation of the word, be it the whole of the meaning or only part, as will be sufficient to separate the things contained under that word from all others. Thus the following, I believe, is a complete definition of an elephant: An animal which naturally drinks by drawing the water into its nose, and...