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differentiable_function [2016/01/23 19:05] nikolaj |
differentiable_function [2016/01/23 19:07] nikolaj |
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- | === Reference === | ||
- | Wikipedia: [[http://en.wikipedia.org/wiki/Differentiable_function|Differentiable function]] | ||
- | |||
=== Theorems === | === Theorems === | ||
- | Let $f(0)=0$, then | + | Let |
- | $f(y\ f^{-1}(x))\ y^{-1}=x+(y-1)\cdot\dfrac{f''(0)}{f'(0)^2}\cdot\dfrac{1}{2}x^2+{\mathcal O}(x^3)$ | + | $f(0)=0\neq f'(0)$, |
+ | |||
+ | then | ||
+ | |||
+ | $\dfrac{ f(y\ f^{-1}(x)) }{y} =x+(y-1)\cdot\dfrac{f''(0)}{f'(0)^2}\cdot\dfrac{1}{2}x^2+{\mathcal O}(x^3)$ | ||
+ | |||
+ | === Reference === | ||
+ | Wikipedia: [[http://en.wikipedia.org/wiki/Differentiable_function|Differentiable function]] | ||
----- | ----- | ||
=== Context === | === Context === | ||
[[Fréchet derivative]], [[Iterated function]] | [[Fréchet derivative]], [[Iterated function]] |