Reference no: EM131017548
Let J ⊆ R be a compact interval and let A be a collection of continuous functions on J→R which satisfy the properties of the Stone-Weierstrass Theorem
[Stone-Weierstrass Theorem: Let K be a compact subset of Rp and let A be a collection of continuous functions on K to R with the properties:
a) The constant function e(x) = 1, x ∈ K belongs to A.
b) If f, g ∈ A, then αf + βg ∈ A, ∀ α, β ∈ R
c) if f, g ∈ A, then fg ∈ A
d) if x ≠ y, x, y ∈ K, ∃f ∈ A, st, f(x) ≠ f(y)
Then any continuous function K to R can be uniformly approximated on K by functions in A.]
Show that any continuous function on J x J ∈ R2 to R can be uniformly approximated by functions of the form f1(x)g1(y) + ... + fn(x)gn(y) where fi, gi, ∈ A.
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