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L  ›  logarithm
L  ›  logarithm
1828 Definition

LOG'ARITHM, n. [Gr. ratio, and number.]

Logarithms are the exponents of a series of powers and roots.

The logarithm of a number is that exponent of some other number, which renders the power of the latter, denoted by the exponent, equal to the former.

When the logarithms form a series in arithmetical progression, the corresponding natural numbers form a series in geometrical progression. Thus,

Logarithms
0 1 2 3 4 5

Natural numbers, 1 10 100 1000 10000 100000

The addition and subtraction of logarithms answer to the multiplication and division of their natural numbers. In like manner, involution is performed by multiplying the logarithm of any number by the number denoting the required power; and evolution, by dividing the logarithm by the number denoting the required root.

Logarithms are the invention of Baron Napier, lord of Marchiston in Scotland; but the kind now in use, were invented by Henry Briggs, professor of geometry in Gresham college at Oxford. They are extremely useful in abridging the labor of trigonometrical calculations.
1913 Definition
Logarithm (logarithm)
n.(lg"å*r***ibreve]***thlig]'m)
Log"a*rithm
[Gr. lo`gos word, account, proportion + 'ariqmo`s number: cf. F. logarithme.] (Math.)
  1. One of a class of auxiliary numbers, devised by John Napier, of Merchiston, Scotland (1550-1617), to abridge arithmetical calculations, by the use of addition and subtraction in place of multiplication and division.
    The relation of logarithms to common numbers is that of numbers in an arithmetical series to corresponding numbers in a geometrical series, so that sums and differences of the former indicate respectively products and quotients of the latter; thus,


    0 1 2 3 4 Indices or logarithms
    1 10 100 1000 10,000 Numbers in geometrical progression


    Hence, the logarithm of any given number is the exponent of a power to which another given invariable number, called the base, must be raised in order to produce that given number. Thus, let 10 be the base, then 2 is the logarithm of 100, because 102 = 100, and 3 is the logarithm of 1,000, because 103 = 1,000.

    Arithmetical complement of a logarithm, the difference between a logarithm and the number ten. -- Binary logarithms. See under Binary. -- Common logarithms, or Brigg's logarithms, logarithms of which the base is 10; -- so called from Henry Briggs, who invented them. -- Gauss's logarithms, tables of logarithms constructed for facilitating the operation of finding the logarithm of the sum of difference of two quantities from the logarithms of the quantities, one entry of those tables and two additions or subtractions answering the purpose of three entries of the common tables and one addition or subtraction. They were suggested by the celebrated German mathematician Karl Friedrich Gauss (died in 1855), and are of great service in many astronomical computations. -- Hyperbolic, or Napierian, logarithms, those logarithms (devised by John Speidell, 1619) of which the base is 2.7182818; -- so called from Napier, the inventor of logarithms. -- Logistic or Proportionallogarithms., See under Logistic.


1828 dictionary
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