Abstract
It is shown that any n n by n n matrix with determinant 1 whose entries are real or complex continuous functions on a finite dimensional normal topological space can be reduced to a diagonal form by addition operations if and only if the corresponding homotopy class is trivial, provided that n ≠ 2 n \ne 2 for real-valued functions; moreover, if this is the case, the number of operations can be bounded by a constant depending only on n n and the dimension of the space. For real functions and n = 2 n = 2 , we describe all spaces such that every invertible matrix with trivial homotopy class can be reduced to a diagonal form by addition operations as well as all spaces such that the number of operations is bounded.
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