Studies in Deductive Logic: A Manual for StudentsMacmillan, 1896 - 304 páginas |
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Página 36
... People will not look forward to posterity who never look backward to their ancestors . People never look backward to their ancestors who will not look forward to posterity . Whatever is insentient is not an animal . Whatever is an ...
... People will not look forward to posterity who never look backward to their ancestors . People never look backward to their ancestors who will not look forward to posterity . Whatever is insentient is not an animal . Whatever is an ...
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Términos y frases comunes
A. J. Ellis aBc abC abc ABCD ABCD ABCD ABCDef abstract affirmative proposition animals answer assertion Camestres CHAPTER combinations conclusion consistent contradiction contradictory contrapositive converse Crown 8vo crystals Deductive Logic disjunctive distributed Edition Elementary Lessons equal equation Equational Logic equationally equivalent existence expressed fallacy false falsity following propositions foraminifera Formal Logic fourth figure give Hamilton Hence Illicit Process inductive inference involving Laws of Thought Lessons in Logic Logical Alphabet logical conditions logical force Logical Index logical relation logicians major premise major term mathematical meaning metals middle term minor term Morgan mortal negative premises non-disjunctive not-A obverse particular possible predicate Principles of Science problem Professor Prove qualities quantity question reasoning right angles rules second figure singular student substances substitution syllogistic symbols things third figure Thomson three terms triangles true Undistributed Middle universal affirmative valid syllogism Xs are Ys
Pasajes populares
Página 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.
Página 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.
Página 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.
Página 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.
Página 26 - For he that fights and runs away May live to fight another day, But he that is in battle slain Will never rise to fight again.
Página 82 - Now these things were our examples, to the intent we should not lust after evil things, as they also lusted.
Página 168 - A miracle is a violation of the laws of nature ; and as a firm and unalterable experience has established these laws, the proof against a miracle, from the very nature of the fact, is as entire as any argument from experience can possibly be imagined.
Página 72 - The middle term must be distributed once at least, / and must not be ambiguous. 4. No term must be distributed in the conclusion which was not distributed in one of the premises. 5. From negative premises nothing can be inferred. 6. If one premise be negative, the conclusion must be negative; and vice versa, to prove a negative conclusion one of the premises must be negative.
Página 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.
Página 16 - Another, when men make a name of two names, whose significations are contradictory and inconsistent; as this name, an 'incorporeal body,' or, which is all one, an 'incorporeal substance,' and a great number more. For, whensoever any affirmation is false, the two names of which it is composed put together and made one signify nothing at all. For example, if it be a false affirmation to say 'a quadrangle is round...