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P-adic exponential function : ウィキペディア英語版
P-adic exponential function

In mathematics, particularly ''p''-adic analysis, the ''p''-adic exponential function is a ''p''-adic analogue of the usual exponential function on the complex numbers. As in the complex case, it has an inverse function, named the ''p''-adic logarithm.
==Definition==
The usual exponential function on C is defined by the infinite series
:\exp(z)=\sum_^\infty \frac.
Entirely analogously, one defines the exponential function on C''p'', the completion of the algebraic closure of Q''p'', by
:\exp_p(z)=\sum_^\infty\frac.
However, unlike exp which converges on all of C, exp''p'' only converges on the disc
:|z|_p
This is because ''p''-adic series converge if and only if the summands tend to zero, and since the ''n''! in the denominator of each summand tends to make them very large ''p''-adically, rather a small value of ''z'' is needed in the numerator.

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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