EntityQ904849· pop 6· linked from 24 articlesPartial isometrySign in to savelinear map between Hilbert spacesConnectionsInternational Standard Book NumberEntitycomplex numberEntityJohn von NeumannEntitydigital object identifierEntitymatrixEntityvector spaceEntityQ180686EntitybibcodeEntityHilbert spaceEntityfunctional analysisEntityQ118398Entityequivalence relationEntityinjectionEntityQ229883Entitylinear mapEntitybasisEntityif and only ifEntityisometryEntityProceedings of the National Academy of Sciences of the United States of AmericaEntitydimension of a vector spaceEntityCategoriesC*-algebrasOperator theorySemigroup theory