Abstract
Lp approximation capability of radial basis function (RBF) neural networks is investigated. If g: R+1 → R1 and \( g(\parallel x\parallel _{R^n } ) \) ∈ Llocp(Rn) with 1 ≤ p < ∞, then the RBF neural networks with g as the activation function can approximate any given function in Lp(K) with any accuracy for any compact set K in Rn, if and only if g(x) is not an even polynomial.
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