“The above proposition is occasionally useful.”

—  Bertrand Russell

Comment after the proof that 1+1=2, completed in Principia Mathematica, Volume II, 1st edition (1912), page 86 http://quod.lib.umich.edu/cgi/t/text/pageviewer-idx?c=umhistmath&cc=umhistmath&idno=aat3201.0002.001&frm=frameset&view=image&seq=126
1910s

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Bertrand Russell 562
logician, one of the first analytic philosophers and politi… 1872–1970

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