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SOME THEOREMS CONCERNING FUNCTION ALGEBRAS

    https://doi.org/10.1142/9789814415514_0008Cited by:0 (Source: Crossref)
    Abstract:

    In what follows, C will be a compact Hausdorff space, and will be a uniformly closed separating algebra of continuous complexvalued functions on C. That is, sums, products, and complex multiples of elements of are in , uniform limits of elements of are in , and for distinct points x and y in C there exists f in with f(x)≠f(y). Šilov (see [1]) has shown that there exists a smallest closed subset B of C, called the Šilov boundary of such that for each f in there exists x in B with |f(x)| = ∥f∥, where ∥f∥ = max {|f(y)| : yC}. The following theorem generalizes this result, in case C is metric…