| 单词 | number systems |
| 释义 | number systems The Greek number system used letters to stand for numbers. For example, α, β, γ, and δ represented 1, 2, 3, and 4; and ι, κ, λ, and µ represented 10, 20, 30, and 40. The Roman number system is still known today and used for some special purposes. Roughly speaking, each Roman numeral is repeated as often as necessary to give the required total, with the larger numerals appearing before the smaller, except that if a smaller precedes a larger its value is subtracted. For example, IX, XXVI, and CXLIV represent 9, 26, and 144. See appendix 21. The Hindu–Arabic number system, in which numbers are generally written today, uses the Arabic numerals and a positional notation with base 10. It originated in India, where records of its use go back to the 6th century. It was introduced to Europe in the 12th century, promoted by Fibonacci and others. |
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数学辞典收录了4151条数学词条，基本涵盖了常用数学知识及数学英语单词词组的翻译及用法，是数学学习的有利工具。