Logic In 3 Books Of Thought Of Investigation And Of Knowledge

Author : Hermann Lotze
Publisher : Forgotten Books
ISBN 13 : 9781330118788
Total Pages : 354 pages
Book Rating : 4.1/5 (187 download)

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Download or read book Logic, Vol. 1 of 3 written by Hermann Lotze and published by Forgotten Books. This book was released on 2015-06-16 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Logic, Vol. 1 of 3: In Three Books of Thought, of Investigation and of Knowledge 240. True conclusions, as Aristotle has observed, can be correctly drawn from false premises. Every Laplander is a born poet, Homer was a Laplander, and therefore - by the first figure - a poet. All parasitic plants have red flowers, no rose has red flowers, therefore - by the second figure - roses are not parasitic plants. Metals do not conduct electricity, all metals are non-fusible, and hence - according to the third figure - non-fusible substances exist, which are non-conductors of electricity. Alter Laplander into Greek, plants which have red flowers into plants which have exploding seed-vessels, and write glass for metal, and in each example one premise will be true, while by inserting a new middle term in each case you may make both premises true, but in every case the conclusion follows with neither more nor less validity. Let T be a perfectly true proposition, S its subject, and P its predicate; then a middle term M may be chosen at random so long as the terms are arranged in both premises on the model of an Aristotelian figure: if this is done the conclusion T will always follow according to the figure. We shall see why this is universally true, if we take as our middle term an abstract symbol M, instead of a concrete term: thus, all M are poets, Homer was an M; all parasitic plants are M, roses are not M; all M are non-conductors, all M are non-fusible. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.