A Short Introduction to the Study of Logic

Johnstone, Laurence

ISBN 10: 145902110X / ISBN 13: 9781459021105

Editore: General Books LLC, 2012

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Used - Like New. This is a reproduction of an out of print title. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. Your purchase helps support Sri Lankan Children's Charity 'The Rainbow Centre'. Our donations to The Rainbow Centre have helped provide an education and a safe haven to hundreds of children who live in appalling conditions. Codice articolo Z1-B-026-01043

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Titolo: A Short Introduction to the Study of Logic

Casa editrice: General Books LLC

Data di pubblicazione: 2012

Legatura: Brossura

Condizione: Like New

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1887 Excerpt: ... arsenic trioxide, arsenic peutoxide, arseniuretted hydrogen, arsenic disulphide, trisulphide, and pentasulphide, would be to leave out of count the previous division into oxides of arsenic, arsenic and hydrogen, arsenic and sulphur. (6.) Division should be short and simple: hence it should be neither too comprehensive nor too detailed; otherwise, instead of furthering and elucidating a survey of the divisible whole, it will only render it laborious and puzzling. Labyrinthine subdivisions divert the mind from the main point, fix it upon minute details, and induce the very confusion they were intended to correct. Seneca says: "A thing divided to dust is as good as confused." CHAPTER IX. XXI. Argument. XXII. Demonstrative arguments. XXIII. Rules for demonstrative arguments. XXI. Argument or Demonstration. After having defined the subject of our inquiry, and divided it into its component parts, the next step is to establish the truth of our assertion through the medium of principles or grounds. This is done by argument, or demonstration in the wide sense of the word, and its end is to verify objective truth, and make it certain to our minds. The value of an argument in establishing Truth and Certainty depends entirely upon its force and the degree of evidence it exhibits, which may be either convincing in various degrees, or the reverse. From this point of view, 'all arguments fall into two great classes, viz. (1.) Certain or Demonstrative, in which the evidence is in itself convincing; and (2.) Probable or Doubtful, in which proofs are merely probabilities, and therefore are non-convincing. It is obvious that, of these two classes, only the first can be called demonstration in the strict sense of the word. XXII. A Demonstrative Argument or Demonstration strict...