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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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更新时间:2025/6/23 18:50:50