First notions
First notions of logic (preparatory to the study of geometry)
作者：De Morgan, Augustus, 1806-1871
体例：题 章数：28
字数：43,845 来源：Project Gutenberg
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- 篇幅分布
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- 原文溯源
cache/epub/67017/pg67017.txt（Project Gutenberg）
章节目录
共 28 题- BY
- AUGUSTUS DE MORGAN,
- LONDON:
- PRINTED FOR TAYLOR AND WALTON,
- BOOKSELLERS AND PUBLISHERS TO UNIVERSITY COLLEGE.
- 28 UPPER GOWER STREET.
- M.DCCC.XXXIX.
- A │is│ B
- A │is│ B
- Every A is B and No A is B
- Every A is X│All the △ is in the ○ A
- Every X is A│ All the ○ is in the △ A
- Every X is B│ All the ○ is in the □ A
- Every X is A│ All the ○ is in the △ A
- Every X is B│ „
- Every X is A, Every X is B, therefore Some A is B
- I shall now give a few detached illustrations of what precedes.
- But if we are at liberty further to say that
- All the As make up _part of part_ (only) of the Bs
- Similarly, according as a particular case (M) is or is not Z, we have
- Every A is B (1)
- Every (thing not A) is not B (2)
- Every B is A (3)
- CONSEQUENCE: then it follows that
- Thus we have the succession of such results as in the following table:—
- Odds in favour of an event Probability for Probability against
- THE END.
- TRANSCRIBER’S NOTES