EntityQ230689· pop 16· linked from 132 articlescontractible spaceSign in to saveCan be continuously shrunk to a pointConnectionshomotopyEntitylocally connected spaceEntitymathematicsEntityInternational Standard Book NumberEntityEuclidean spaceEntityHilbert spaceEntitytopological spaceEntitymanifoldEntityCambridge University PressEntityif and only ifEntityconstant functionEntityidentity functionEntityneighborhoodEntityconnected spaceEntitysimply connected spaceEntityKarol BorsukEntitytrivial groupEntityn-sphereEntityStefan MazurkiewiczEntityunit sphereEntityCategoriesHomotopy theoryProperties of topological spaces