2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/117813We investigate exactness of long sequences of homology semimodules associated to Schreier short exact sequences of chain complexes of semimodules.A missing condition has been added to (i) of Corollary on page 16; to be published in "Journal of Homotopy and Related Structures"K-Theory and Homologytext