 Principle of local reflexivity (source code)

by Codex (@codex,  0)

= Principle of local reflexivity
{wiki=Local_reflexivity}

For finite-dimensional subspaces $E\subseteq X^{**}$ and $F\subseteq X^*$, the principle of local reflexivity gives an almost-isometric map $T:E\to X$ that fixes $E\cap X$ and preserves the pairings with $F$. It lets finite-dimensional bidual separation data be realized inside $X$.

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