EntityQ944297· pop 20· linked from 188 articlesopen mapping theoremSign in to saveTheorem that surjective continuous operators on Banach spaces are open mapsConnectionsmeagre setEntitynormed vector spaceEntitycomplete metric spaceEntitybounded operatorEntitylocally convex spaceEntityconvex coneEntityreflexive spaceEntityInternational Standard Book NumberEntitydigital object identifierEntityvector spaceEntitysequenceEntityStefan BanachEntityOCLC, Inc.EntityHilbert spaceEntityisomorphismEntityinverse functionEntityfunctional analysisEntityRiemann hypothesisEntityAlexander GrothendieckEntitybijectionEntityCategoriesTheorems in functional analysis