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arxiv: math/0101012 · v1 · submitted 2001-01-02 · 🧮 math.CA

Necessary and sufficient conditions for differentiating under the integral sign

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keywords integralconditionsdifferentiatingnecessarysignsufficientunderable
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We give necessary and sufficient conditions for differentiating under the integral sign an integral that depends on a parameter. The conditions require the equality of two iterated integrals and depend on being able to integrate every derivative. The Henstock integral is thus used in an essential way.

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