Bourbaki

Corollary 2

Tag 08F6, permanent. Cite it as [Bourbaki, Tag 08F6].

Functions of a Real Variable, chapter V, § 3. ASYMPTOTIC EXPANSIONS OF FUNCTIONS OF A REAL VARIABLE

If ff and gg are ⩾0\geqslant 0 and not identically zero on [a,+∞[[a, +\infty[, and such that f⪰gf \succeq g, then ∫axf(t) dt⪰∫axg(t) dt\int_a^x f(t)\,dt \succeq \int_a^x g(t)\,dt.

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

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Cites

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Transcribed from the printed volume. Not translated.