2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/53614This is a summary of a talk based on hep-th/9305139 and presented at the SUSY-93 International Workshop. We study infinite dimensional unbroken gauge symmetries which arise when time is toroidally compactified in string theory.11 pages, YCTP-P18-93High Energy Physics - Theorytext