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Ah that makes sense, regular definition of basis is not much of use in infinite dimension anyways as far as I recall. Wonder if differentiability is required for what you said since polynomials on compact domains (probably required for uniform convergence or sth) would also work for cont functions I think.
yeah, that's exactly why we have an alternative definition for that :D
Differentiability is not required; what is required is a topology, i.e. a definition of convergence to make sure the infinite series are well-defined.