The Elements of Logic: In Four Books ...L. Nichols, & Company, 1802 - 239 σελίδες |
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according affirmed antecedent appear applied aqua regia arise arrive bodies called certainty combinations compared complex ideas complex notions compound comprehended conceptions conclusion connexion consequent consideration considered constitute copula deduced definitions demonstration denote derived discern discoveries disjunctive proposition Disjunctive Syllogisms distinct distinctly distinguished division enthymemes equal established Euclid evident existence experience explained express farther figure foundation frame furnish genus gisms Hence human knowledge hypothetical syllogism innu insomuch instance intermediate ideas intuitive invention ject judgments kind known ledge logicians manner mathematicians means method middle term mind modus tollens natural philosophy necessarily necessary neral notice objects observe ourselves particular perceptions plain powers predicate premises principles proceed proper properties proposition relations rules self-evident simple ideas sion sorites species stand step substances suppose syllogisms thence ther thereby thoughts tion trace true truth understanding unfolding universal universal proposition whence whole wholly words
Δημοφιλή αποσπάσματα
Σελίδα 150 - I HAVE mentioned mathematics as a way to settle in the mind a habit of reasoning closely and in train ; not that I think it necessary that all men should be deep mathematicians, but that, having got the way of reasoning, which that study necessarily brings the mind to, they might be able to transfer it to other parts of knowledge, as they shall have occasion.
Σελίδα 169 - Men suffer all their life long under the foolish superstition that they can be cheated. But it is as impossible for a man to be cheated by any one but himself as for a thing to be, and not to be, at the same time.
Σελίδα 150 - Just so it is in the mind; would you have a man reason well, you must use him to it betimes, exercise his mind in observing the connexion of ideas, and following them in train. Nothing does this better than mathematics; which, therefore, I think should be taught all those who have the time and opportunity ; not so much to make them mathematicians, as to make them reasonable creatures...
Σελίδα 136 - But how can these men think the use of reason necessary to discover principles that are supposed innate, when reason (if we may believe them) is nothing else but the faculty of deducing unknown truths from principles or propositions that are already known? That certainly can never be thought innate which we have need of reason to discover; unless, as I have said, we will have all the certain truths that reason ever teaches us, to be innate. We may as well think the use of reason necessary to...
Σελίδα 98 - Thus, that the whole is greater than any of its parts, is an intuitive judgment; nothing more being required to convince us of its truth than an attention to the ideas of whole and part. And this too is the...
Σελίδα 158 - ... the minds of all men ; in which case it is usually omitted, whereby we have an imperfect syllogism, that seems to be made up of only two proposition.
Σελίδα 159 - This gives a pleasure not unlike to that •which the author himself feels in composing. It besides shortens discourse, and adds a certain force and liveliness to our arguments, when the words in which they are conveyed, favour the natural quickness of the mind in its operations, and a single expression is left to ex« hibit a whole train of thoughts.
Σελίδα 168 - That in which the middle term is the subject of the major proposition, and the predicate of the minor.
Σελίδα 119 - ... to call in any thing more evident by way of confirmation. But, where the connexion or repugnance comes not so readily under the inspection of the mind, there we...
Σελίδα 65 - For we are naturally led to imagine, that the same objects operate alike upon the organs of the human body, and produce an uniformity of sensations.