BAYZID, Djamila2021-07-122021-07-122021http://dspace.univ-msila.dz:8080//xmlui/handle/123456789/24862In this work we study the spectral continuity using the v-convergence. Where we have given a definition of the spectrum and after that we stady two classes of the essential spectrum and present Also characterization of essential spectra.enEssential spectrum, The v-convergence, Spectral continuity.ON THE SPECTRAL CONTINUITY USING THE -CONVERGENCEThesis