All men are mortal, so, by obversion, no men are immortal.
Source: wiktionary
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2 total sentences available.
All men are mortal, so, by obversion, no men are immortal.
Source: wiktionary
From 'warmth is agreeable' we can affirm, by formal obversion, 'warmth is not disagreeable, and not indifferent.' We cannot affirm, without an examination of the subject matter, 'cold is disagreeable.'
Source: wiktionary