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Concept of antiderivative

Antiderivative FF for ff
A function FF is called an antiderivative of ff on an interval II if FF is differentiable on II and for all xIx\in I F(x)=f(x).F'(x)=f(x). The family of antiderivatives on II differs by an arbitrary constant CRC\in\mathbb{R}: if FF is one antiderivative, then all antiderivatives are F(x)+CF(x)+C. Thus, to list “all antiderivatives” on a connected interval means giving F(x)+CF(x)+C for a fixed FF and arbitrary CRC\in\mathbb{R}.
The interval II matters: on a union of two disjoint pieces the constants may differ on different pieces
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