Einstein’s First Proof

A physicist’s genius turns up in his boyhood geometry.Illustration by Tomi Um On November 26, 1949, Albert Einstein published an essay in the Saturday Review of Literature in which he described two pivotal moments in his childhood. The first involved a compass that his father showed him when he was four or five. Einstein recalled his sense of wonderment that the needle always pointed north, even t

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少年時代のアインシュタインによる（と推測される）ピタゴラスの定理の証明の話