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Abak

Abak (lot. abacus), abak, asbobi arifmetikiest az chub va muhrahoi makhsus, baistiloh, nakhustin «kalkulyatori chubin» dar jahon. Abak chun asbobi muhosibi dar tamomi kishvarhoi qadim istifoda meshud va to hanuz dar kishvarhoi Osiyo, az jumla dar Tojikiston bo nomi «chut» bazan istifoda meshavad. Riyozidoni asrimiyonagii Italiya Leonardo Pizan­skiy, ki bo nomi Fibonachchi maruf ast (1170 – 1250), asare bo nomi «Kitobi abak» niz talif namudaast.

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