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Power of two
・ Power of two (disambiguation)
・ Power of Veto
・ Power of Women
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Power of two : ウィキペディア英語版
Power of two

In mathematics, a power of two means a number of the form where is an integer, i.e. the result of exponentiation with number two as the base and integer  as the exponent.
In a context where only integers are considered, is restricted to non-negative values, so we have 1, 2, and 2 multiplied by itself a certain number of times.
Because two is the base of the binary numeral system, powers of two are common in computer science. Written in binary, a power of two always has the form 100…000 or 0.00…001, just like a power of ten in the decimal system.
==Expressions and notations==
Verbal expressions, mathematical notations, and computer programming expressions using a power operator or function include:
: 2 to the ''n''
: 2 to the power of ''n''
: 2 power ''n''
: power(2, ''n'')
: pow(2, ''n'')
: 2''n''
: 1 << ''n''
: 2 ^ ''n''
: 2
*
* ''n''
: 2 () ''n''
: 2 ↑ ''n''
: ''A''(''n'' - 3, 3) + 3
: H_3(2,n)
: 2 \to n
: 2 \to n \to 1

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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