2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/231335We calculate certain ext-groups between modules for a linear algebraic group. The results are in agreement with the Lusztig conjecture.Appendix to "On the good filtration dimension of Weyl modules for a linear algebraic group" by A.E. Parker, arXiv:math/0507552; in J. reine angew. Math, 2003Representation Theory16G99, 20G05 and 20G10text