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File:Augustus De Morgan, 1898.jpg

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Español: Fotografía de Augustus De Morgan (publicada en 1898)
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http://culturemath.ens.fr/histoire%20des%20maths/htm/Lemignot11/article2/la-percee-due-a-boole.html

Alain Le Mignot
Author The Open Court Publishing (1898)

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