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- W4386376502 abstract "Abstract Let X be a compact metric space, C ( X ) be the space of continuous real-valued functions on X and $A_{1},A_{2}$ be two closed subalgebras of C ( X ) containing constant functions. We consider the problem of approximation of a function $fin C(X)$ by elements from $A_{1}+A_{2}$ . We prove a Chebyshev-type alternation theorem for a function $u_{0} in A_{1}+A_{2}$ to be a best approximation to f ." @default.
- W4386376502 created "2023-09-02" @default.
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- W4386376502 date "2023-09-01" @default.
- W4386376502 modified "2023-10-14" @default.
- W4386376502 title "A Chebyshev-type Alternation Theorem for Best Approximation by a Sum of Two Algebras" @default.
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- W4386376502 doi "https://doi.org/10.1017/s0013091523000494" @default.
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