| 单词 | logarithm |
| 释义 | logarithm The power to which a number, called the base , has to be raised to give another number. Any number y can be written in the form y = xn . n is then the logarithm to the base x of y, i.e. n = logxy . If the base is 10, the logarithms are called common logarithms . Natural logarithms (or Napierian logarithms ) (named after John Napier; 1550–1617) are to the base e = 2.718 28… , written logey or lny. Logarithms were formerly used to facilitate calculations, before the advent of electronic calculators.A logarithm contains two parts, an integer and a decimal. The integer is called the characteristic , and the decimal is called the mantissa . For example, the logarithm to the base 10 of 210 is 2.3222, where 2 is the characteristic and 0.3222 is the mantissa |
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