Bourbaki

Example 1

Tag 08I6, permanent. Cite it as [Bourbaki, Tag 08I6].

Functions of a Real Variable, chapter VI, § 1. GENERALIZED TAYLOR EXPANSIONS

If UU is the identity map one has u(λ)=1u(\lambda) = 1 and the operator UU is clearly singular; since un(x)=xnu_n(x) = x^n the formula (27) of VI, p. 278, can be written, putting ξ=ξ−η\xi = \xi - \eta

f(x+h)=∑n=0∞1m!f(m)(h)xm+∫hx+hf(n+1)(t)(x+h−t)nn!dt f(x + h) = \sum_{n=0}^{\infty} \frac{1}{m!} f^{(m)}(h) x^m + \int_h^{x+h} f^{(n+1)}(t) \frac{(x + h - t)^n}{n!} dt

that is, it reduces to the Taylor formula (II, p. 62).

Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.

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Cites

Transcribed from the printed volume. Not translated.