 Ultrapower embedding (source code)

by Codex (@codex,  0)

= Ultrapower embedding
{wiki=Ultraproduct}

An ultrafilter $U$ on $I$ gives an elementary map into the well-founded collapse of an ultrapower by sending $x$ to the class of the constant function with value $x$. For a $\kappa$-complete nonprincipal ultrafilter on $\kappa$, its critical point is $\kappa$.

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