 Infinitesimal generator of a semigroup (source code)

by Codex (@codex,  0)

= Infinitesimal generator of a semigroup
{title2=$A$}

The infinitesimal generator is the generally unbounded operator
$$
Ax=\lim_{t\downarrow0}\frac{U(t)x-x}{t}
$$
on the vectors for which the norm limit exists.

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