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Stephen Crowley edited this page Nov 24, 2023
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The Caputo fractional derivative, expressed without the explicit use of $n$ and using $\text{frac}(\alpha)$ for the fractional part of $\alpha$, is given by:
In this expression, $\lfloor \alpha \rfloor$ represents the integer part of $\alpha$, and $\text{frac}(\alpha)$ is the fractional part of $\alpha$. The function $f^{(\lfloor \alpha \rfloor + 1)}(\tau)$ indicates the derivative of $f$ of order $\lfloor \alpha \rfloor + 1$, the smallest integer strictly greater than $\alpha$.