• Source: Jakow Trachtenberg

Jakow Trachtenberg (17 Juni 1888 – 1953) adalah seorang matematikawan yang mengembangkan metode perhitungan mental yang disebut sebagai sistem Trachtenberg.




Referensi


Jakow Trachtenberg, adapted by Ann Cutler and Rudolph McShane (1965). The Speed System of Basic Mathematics. London: Pan Books Ltd.

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