2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35659We study the problem of gauge-invariance and gauge-dependence in one-loop quantum cosmology. We formulate some requirements which should be satisfied by boundary conditions in order to give gauge-independent path integral. The case of QED is studied in some detail. We outline difficulties in gauge-invariant quantization of gravitational field in a bounded region.LATeX, 8 pagesGeneral Relativity and Quantum Cosmologytext