definition
A minor addition to a text.
definition
The part of a common logarithm after the decimal point, the fractional part of a logarithm.
definition
The significand; that part of a floating-point number or number in scientific notation that contains its significant digits.
synonyms
The logarithms to base io of the first twelve numbers to 7 places of decimals are log 1 =0.0000000 log 5 log 2 = 0.3010300 log 6 log 3 =0.477 121 3 log 7 log 4 =0.6020600 log 8 The meaning of these results is that The integral part of a logarithm is called the index or characteristic, and the fractional part the mantissa.
The whole-number part of a logarithm is called the characteristic; the fractional part is called the mantissa.
The first to publish a general collection of treaties was Leibnitz, whose Codex juris gentium, containing documents from 1097 to 5497, " ea quae sola inter liberos populos legum sunt loco " appeared in 1693, and was followed in 1700 by the Mantissa.
For floating point types, digits is the number of radix digits in the mantissa.
When the base is to, the logarithms of all numbers in which the digits are the same, no matter where the decimal point may be, have the same mantissa; thus, for example, log 2.5613 =0-4084604, log 25.613 =1.4084604, log 2561300 = 6.4084604, &c.
The fact that when the base is io the mantissa of the logarithm is independent of the position of the decimal point in the number affords the chief reason for the choice of io as base.
The explanation of this property of the base io is evident, for a change in the position of the decimal points amounts to multiplication or division by some power of 10, and this corresponds to the addition or subtraction of some integer in the case of the logarithm, the mantissa therefore remaining intact.
In tables of logarithms of numbers to base io the mantissa only is in general tabulated, as the characteristic of the logarithm of a number can always be written down at sight, the rule being that, if the number is greater than unity, the characteristic is less by unity than the number of digits in the integral portion of it, and that if the number is less than unity the characteristic is negative, and is greater by unity than the number of ciphers between the decimal point and the first significant figure.
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