Particular Negative
:: Example: Some metals are not brittle.

Euler diagrams in the era of Venn

John Venn (1834-1923) comments on the remarkable prevalence of the Euler diagram:
: "... of the first sixty logical treatises, published during the last century or so, which were consulted for this purpose-somewhat at random, as they happened to be most accessible-it appeared that thirty four appealed to the aid of diagrams, nearly all of these making

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