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Books Books 1 - 2 of 2 on In common conversation the affirmation of a part is meant to IMPLY the denial of....  
" In common conversation the affirmation of a part is meant to IMPLY the denial of the remainder. Thus, by 'some of the apples are ripe', it is always [sic!] INTENDED TO SIGNIFY that some are not ripe. "
First notions of logic, preparatory to the study of geometry - Page 6
by Augustus De Morgan - 1840 - 32 pages
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Formal logic: or, The Calculus of inference, necessary and probable

Augustus De Morgan - Logic, Symbolic and mathematical - 1847 - 336 pages
...Particular Affirmative Some Xs are Ys O Particular Negative Some Xs are not Ys - In common converfation the affirmation of a part is meant to imply the denial of the remainder. Thus, by ' fome of the apples are ripe,' it is always intended to fignify that fome are not ripe. JThis is not...
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Studies in Deductive Logic: A Manual for Students

William Stanley Jevons - Logic - 1896 - 304 pages
...interpretation of ' some,' and that which applies in colloquy. De Morgan says (Formal Logic, p. 4), ' In common conversation the affirmation of a part is...always intended to signify that "some are not ripe." There is no difficulty in providing in formal logic for this use of the word by stating explicitly...
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