2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/166402Generalizing results by Bryant and Griffiths [Duke Math. J., 1995, V.78, 531-676], we completely describe local conservation laws of second-order (1+1)-dimensional evolution equations up to contact equivalence. The possible dimensions of spaces of conservation laws prove to be 0, 1, 2 and infinity. The canonical forms of equations with respect to contact equivalence are found for all nonzero dimensions of spaces of conservation laws.11 pages, minor correctionsAnalysis of PDEsMathematical Physics35K55; 35K57; 35A30text