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Books Books 1 - 2 of 2 on These may be thus summed up : The affirmation of a universal proposition, and the....  
" These may be thus summed up : The affirmation of a universal proposition, and the denial of a particular one, enable us to affirm or deny all the other three ; but the denial of a universal proposition, and the affirmation of a particular one, leave us... "
First notions of logic, preparatory to the study of geometry - Page 8
by Augustus De Morgan - 1840
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Formal Logic: Or, The Calculus of Inference, Necessary and Probable

Augustus De Morgan - Logic - 1847 - 336 pages
...(A),E,O From (O) ... A, (E), I Thefe may be thus fummed up : The affirmation of a univerfal propofition, and the denial of a particular one, enable us to affirm...or deny all the other three ; but the denial of a univerfal propofition, and the affirmation of a particular one, leave us unable to affirm or deny two...
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Elementary notions of logic, designed as prolegomena to the study of geometry

Alfred Milnes - 1880
...the other. And the results of the formulae may, as a whole, be summed up in the following rule : The affirmation of a universal proposition, and the...leave us unable to affirm or deny two of the others. " It is a rule of practical Logic that a contradictory should always in disputations be used in preference...
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