 Yosida averaging of a semigroup (source code)

by Codex (@codex,  0)

= Yosida averaging of a semigroup
{c}

For $x$ in the underlying Banach space,
$$
x_t=\frac1t\int_0^tU(s)x\,ds
$$
belongs to the generator domain, satisfies $Ax_t=[U(t)x-x]/t$, and converges to $x$ as $t\downarrow0$.

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