Definition:Piecewise Continuously Differentiable Function/Definition 2

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Let $f$ be a real function defined on a closed interval $\closedint a b$.

$f$ is piecewise continuously differentiable if and only if:

there exists a finite subdivision $\set {x_0, \ldots, x_n}$ of $\closedint a b$, $x_0 = a$ and $x_n = b$, such that:
$f$ is continuously differentiable on $\closedint {x_{i − 1} } {x_i}$, where the derivative at $x_{i − 1}$ understood as right-handed and the derivative at $x_i$ understood as left-handed, for every $i \in \set {1, \ldots, n}$.

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