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Robert A. Heinlein - Since when did a mathematician...
Since when did a mathematician need any tools but his own head? Pythagoras had done well enough with a stick and a stretch of sand. (Robert A. Heinlein)

Since when did a mathematician need any tools but his own head? Pythagoras had done well enough with a stick and a stretch of sand.

Robert A. Heinlein

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done enough head mathematician need sand stick stretch well pythagoras

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