2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/60657We consider semidensities on a supermanifold E with an odd symplectic structure. We define a new $Δ$-operator action on semidensities as the proper framework for Batalin-Vilkovisky formalism. We establish relations between semidensities on E and differential forms on Lagrangian surfaces. We apply these results to Batalin-Vilkovisky geometry. Another application is to (1.1)-codimensional surfaces in E. We construct a kind of pull-back of semidensities to such surfaces. This operation and the $Δ$-operator are used for obtaining integral invariants for (1.1)-codimensional surfaces.Plain-TeX, 44 pagesDifferential GeometryMathematical Physics58A50; 53B50; 53A55; 81T70text