Definition: A point $\mathbf{m}\in {\mathbb{R}}^d$ is a strict local maximum of a function $f:{\mathbb{R}}^d\to \mathbb{R}$ if there exists a neighborhood $N_r(\mathbf{m})$ such that $f(\mathbf{m})>f(\mathbf{x})$ for all $\mathbf{x}\in N_r(\mathbf{m})$ with $\mathbf{x}\ne \mathbf{m}$.