A Chebyshev-Type Theorem Characterizing Best Approximation of a Continuous Function by Elements of the Sum of Two Algebras.

In the paper, we consider the problem of uniform approximation of a continuous function defined on a compact metric space by elements of the sum of two algebras in the space of all continuous functions on . We prove a Chebyshev-type theorem for characterization of best approximation. [ABSTRACT FROM AUTHOR]