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logan | loganberry | logania | loganiaceae | loganimity | logarithm | logarithmetic | logarithmetical | logarithmetically | logarithmic | logarithmic scale





logarithmn. [Gr. lo`gos word, account, proportion + 'ariqmo`s number: cf. F. logarithme.].
     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.
    "  [1913 Webster]
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 logarithm or Napierian logarithm or Natural logarithm, a logarithm (devised by John Speidell, 1619) of which the base is e (2.718281828459045...); -- so called from Napier, the inventor of logarithms. -- Logistic logarithms or Proportional logarithms, See under Logistic.


logarithm, n.
1 one of a series of arithmetic exponents tabulated to simplify computation by making it possible to use addition and subtraction instead of multiplication and division.
2 the power to which a fixed number or base ( see BASE(1) 7) must be raised to produce a given number (the logarithm of 1000 to base 10 is 3).

common logarithm a logarithm to the base 10. natural (or Napierian) logarithm a logarithm to the base e (2.71828.....).
Abbr.: ln or log**.
logarithmic adj. logarithmically adv.
mod.L logarithmus f. Gk logos reckoning, ratio + arithmos number




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