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Quá trình hình thành số đếm phản ánh các bước phát triển nhận thức / Hoàng Thị Châu.
// Ngôn ngữ. 2014, Số 9. 2015tr. 25-31. Through an analysis of thousands of numeral systems (NS) of the world’s languages in the website of Eugence Chan, the paper highlights the step of NS formation and links it the development process of thought and language in a narrow sense. NS appeared when humans could use their fingers for counting. The primary numbers “1” , “2” , “3”, “4” were named by little finger, ring finger, middle finger, index finger (metaphor, as we are thinking nowadays). The number “5” was not thumb but hand (sum of 5 finger) as the mark of quinary numeration. So as human body was used to name number “20” as a mark to transform quinary numeration to vigesimal, the Romans utilized Latin letters L for “50”, C for “100”, D for “500”, M for “1000” to fill up their ancient digit system with figures of fingers and hands (I, II, III, V, X). Finally, the “0” , beginning the old Arabic digit system for decimal NS, with the number “1” , built up a new Binary NS, used in informatics nowadays.
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