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Jan 26, 2018 at 23:50 comment added Saj_Eda Is it possible to find out what $B^*$ yields acting on particular elements $z=(z_i)$, $k=(k_i)$, $u=(u_i)$ of $\ell ^2$?
Jan 26, 2018 at 22:21 comment added Nik Weaver Well, if $(e_i)$ is an orthonormal basis for $U$ and $(f_j)$ is an orthonormal basis for $Z$ then the matrix entries for $Bk$ would be the values $\langle (Bk)e_i, f_j\rangle$.
Jan 26, 2018 at 21:02 comment added Saj_Eda I meant a basis for U, and Z as well.
Jan 26, 2018 at 21:01 history answered Nik Weaver CC BY-SA 3.0