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zero

(Encyclopedia) zero, that number which, when added to any number, leaves the latter unchanged; its symbol is 0. The introduction of zero into the decimal system was the most significant achievement…

logarithm

(Encyclopedia) logarithmlogarithmlŏgˈərĭᵺəm [key] [Gr.,=relation number], number associated with a positive number, being the power to which a third number, called the base, must be raised in order…

integer

(Encyclopedia) integer: see number; number theory.

subtraction

(Encyclopedia) subtraction, fundamental operation of arithmetic; the inverse of addition. If a and b are real numbers (see number), then the number a−b is that number (called the difference) which…

sudoku

(Encyclopedia) sudoku or su dokusudokus&oomacr;dōˈk&oomacr; [key] [Jap.,=single number], a number puzzle consisting, in its classic form, of a square divided into nine squares, with each…