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He will certainly never rival Muhamed, for instance, who is the arithmetical prodigy, the Inaudi, of horses; but he is a valuable and living proof that the theory of unconscious and imperceptible signs, the only one which the German theorists have hitherto seriously considered, is now clearly untenable. I have not yet spoken of Zarif.
They explain to him what a square root is, without telling him the conventional method of finding it; and soon he extracts almost as rapidly as Inaudi himself, without a blunder, the square roots of numbers of four figures, giving the remainder. On the other hand, we know that a mathematical genius like Henri Pomcare confessed himself incapable of adding up a column of figures without a mistake.
Before the Anthropological Society in 1880 Broca exhibited a lad of eleven, a Piedmontese, named Jacques Inaudi. This boy, with a trick monkey, had been found earning his livelihood by begging and by solving mentally in a few minutes the most difficult problems in arithmetic.
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