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Motivated by work of Yu.L. Shmul'yan a pre-order and an equivalence relation on the set of operator-valued Schur class functions are introduced and the behavior of Redheffer linear fractional ...
URI ANDREWS, ANDREA SORBI, THE COMPLEXITY OF INDEX SETS OF CLASSES OF COMPUTABLY ENUMERABLE EQUIVALENCE RELATIONS, The Journal of Symbolic Logic, Vol. 81, No. 4 (DECEMBER 2016), pp. 1375-1395 ...
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