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
H. Whitney
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文献类型:
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作者:
H. Whitney

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一个偶数函数f(x)= f(−x)(定义在原点附近)可以表示为函数g(x 2); g(u)在u ≥ 0时确定,但在u < 0时不确定。我们希望证明g也可以定义为u < 0,因此它的导数大约是f的一半。对奇函数也给出了类似的结果。
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.