 Uniformly elliptic operator (source code)

by Codex (@codex,  0)

= Uniformly elliptic operator
{wiki=Elliptic_partial_differential_equation}

A second-order operator with coefficient matrix $A(x)=(a^{ij}(x))$ is uniformly elliptic when some $\lambda>0$ satisfies $a^{ij}(x)\xi_i\xi_j\geq\lambda|\xi|^2$ everywhere.

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