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Certain Identities on Derivatives of Radial Homogeneous and Logarithmic Functions

Commun. Math. Anal.
Volume 9, Number 2 (2010), 51 - 66

Certain Identities on Derivatives of Radial Homogeneous and Logarithmic Functions

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Abstract

Let $k$ be a natural number and $s$ be real. In the 1-dimensional case, the $k$-th order derivatives of the functions $\lvert x\rvert^s$ and $\log \lvert x\rvert$ are multiples of $\lvert x\rvert^{s-k}$ and $\lvert x\rvert^{-k}$, respectively. In the present paper, we generalize this fact to higher dimensions by introducing a suitable norm of the derivatives, and give the exact values of the multiples.