We know that mathematicians care no more for logic than logicians for mathematics. The two eyes of science are mathematics and logic; the mathematical set puts out the logical eye, the logical set puts out the mathematical eye; each believing that it sees better with one eye than with two.
— Augustus De Morgan, British mathematician and logician who was blind in one eye. (1806-1871)
Reblogged from Peano
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    (1806-1871)The rule that says “x and y if and only if not ( not x or not y )” is named after this guy. Useful thing,...
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