The Mean Convergence of Orthogonal Series of Polynomials

Abstract

of EB, R is the En and the mapping x(p) satisfies a Lipschitz condition x(p)x(q) < p pq, then a(S) = at(S) coincides with the classical integral and, therefore,2'5 with the various other areas defined by Peano Lebesgue, Rad6 and Federer.For non-rectifiable surfaces the relations are mostly unclear.