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What does $C_c^1((a, b))$ stand for?

I know that $C^1((a, b))$ is a space of functions with the continuous first derivative on $(a, b)$, but I don't know what the small $c$ stands for.

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    $\begingroup$ Usually, this means the functions have compact support. $\endgroup$ Commented May 18, 2020 at 16:36

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Continuous differentiable functions with compact support. That is, continuous differentiable that vanish on all but a compact set.

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