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nydus/The Game of LogicPublic

This instructional book presents a logic game played with a diagram and nine counters. It explains how to express propositions through the relationship between things and their attributes.

Page 63 of 126
Table of Contents

CROSS QUESTIONS.

Taking "persons" as Universe; m="in the house"; x="John"; and y="having a tooth-ache"; represent

  1. John is in the house; Everybody in the house is suffering from tooth-ache.
  1. There is no one in the house but John; Nobody, out of the house, has a tooth-ache.

[See pp. 68-70]

Taking "persons" as Universe; m="I"; x="that has taken a walk"; y="that feels better"; represent

  1. I have been out for a walk; I feel much better.

Choosing your own 'Universe' &c., represent

  1. I sent him to bring me a kitten; He brought me a kettle by mistake.

[See pp. 70, 1]

  1. Both Diagrams to be employed.
                -----------
               |     |     |      -----------
               |   --x--   |     |     |     |
               |  |  |  |  |     |     x     |
               |--y--m--y'-|     |--y--|--y'-|
               |  |  |  |  |     |     x'    |
               |   --x'-   |     |     |     |
               |     |     |      -----------
                -----------

N.B. In each Question, a small Diagram should be drawn, for x and y only, and marked in accordance with the given large Diagram: and then as many Propositions as possible, for x and y, should be read off from this small Diagram.

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