2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/69919An technically interesting proof of a known theorem.5 pp. Part of report TRITA-MAT-1998-47 Royal Inst. of Techn. Stockholm, SwedenAnalysis of PDEsFunctional Analysis26D15, 46E35, 35JA higher order Weierstrass approximation theorem - a new prooftext