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書籍之海 漂流記

看板に掲げているのは「書籍」だけですが、実際は人間の精神の営みすべての海を航海しています。

Wilfred Hodges, "Logic: An Introduction to Elementary Logic"

2018年09月15日 | 抜き書き
〔Is consistency of beliefs a virtue? Is it something we should spend time tryng to achieve?〕To some extent this is a question in a vacuum. Nobody is deliberately incosistent in his beliefs. It is simply impossible to believe, fully and without reservation, twi things which you know are inconstent with each other. ('Cobsistency', p. 15)

Logic is about consistency. ('Consistency', p. 13)

〔A〕 set of beliefs is called consistent if these beliefs could all be true together in some possible situation. ('Consistency', p. 13)

(London: Penguin Books, 1977)