The Art of Logical Thinking; Or, the Laws of Reasoning

The Art of Logical Thinking; Or, the Laws of Reasoning

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ...Avoiding this, we transfer the negative particle from the copula to the predicate so that the convertend becomes "I" which is converted by Simple Conversion. Thus we transfer' Some men are not mortal' into' Some men are notmortal" from which we easily convert (by simple Conversion) the proposition: "Some not-mortals are men." It will be well for students, at this point, to consider the three following Fundamental Laws of Thought as laid down by the authorities, which are as follows: The Law of Identity, which states that: "The same quality or thing is always the same quality or thing, no matter how different the conditions in which it occurs." The Law of Contradiction, which states that: "No thing can at the same time and place both be and not be." The Law of Excluded Middle, which states that: "Everything must either be or not be; there is no other alternative or middle course." Of these laws, Prof. Jevons, a noted authority, says: ' Students are seldom able to see at first their full meaning and importance. All arguments may be explained when these selfevident laws are granted; and it is not too much to say that the whole of logic will be plain to those who will constantly use these laws as the key." CHAPTER XI. INDUCTIVE REASONING Inductive Reasoning, as we have said, is the process of discovering general truth from particular truths, or inferring general laws from particular facts. Thus, from the experience of the individual and the race regarding the particular truth that each and every man under observation has been observed to die sooner or later, it is inferred that all men die, and hence, the induction of the general truth that "All men must die." Or, as more

Product details

  • Paperback | 34 pages
  • 189 x 246 x 2mm | 82g
  • United States
  • English
  • black & white illustrations
  • 1236740254
  • 9781236740250