2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/114653The topological invariants of gapped time reversal invariant lattice superconductors are studied by mapping the superconducting mean field Hamiltonian to a Bloch Hamiltonian. There is a single $Z_2 $ invariant in two dimensions and four such invariants in three dimensions. We briefly discuss the properties of states with non-trivial topological invariants.brief note on topological invariants for superconductorsSuperconductivitytext