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Hobby–Rice theorem
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Hobby–Rice theorem : ウィキペディア英語版
Hobby–Rice theorem
In mathematics, and in particular the necklace splitting problem, the Hobby–Rice theorem is a result that is useful in establishing the existence of certain solutions. It was proved in 1965 by Charles R. Hobby and John R. Rice; a simplified proof was given in 1976 by A. Pinkus.
==The theorem==
Given an integer ''k'', define a ''partition'' of the interval () as a sequence of numbers which divide the interval to k+1 subintervals:
: 0=z_0 < z_1 < \dotsb < z_k < z_ = 1
Define a ''signed partition'' as a partition in which each subinterval i has an associated sign \delta_i:
: \delta_1,\dotsc,\delta_\in\left\
The Hobby-Rice theorem says that for every ''k'' continuously integrable functions:
: g_1,\dotsc,g_k\colon()\longrightarrow\Bbb
there exists a signed partition of () such that:
: \sum_^\delta_i\!\int_ g_j(z)\,dz=0\text1\leq j\leq k.
(in other words: for each of the ''k'' functions, its integral over the positive subintervals equals its integral over the negative subintervals).

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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