1)Let A, B, C, D be a Banach algebras, and U be a free ultrafilter. Can we see that ultrapowers of \begin{pmatrix} A & B \\ C & D \end{pmatrix} equal to \begin{pmatrix} (A)_U & (B)_U \\ (C)_U & (D)_U \end{pmatrix}
2026-03-30 10:43:13.1774867393
ultrapowers of a matrix
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