Differentiable even functions
Differentiable even functions
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可微偶函数
DOI:
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发表时间:
1943
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通讯作者:
H. Whitney
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文献类型:
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作者:
H. Whitney
An even function f (x) = f (−x) (defined in a neighborhood of the origin) can be expressed as a function g(x 2); g(u) is determined for u ≥ 0, but not for u < 0. We wish to show that g may be defined for u < 0 also, so that it has roughly half as many derivatives as f. A similar result for odd functions is given.