EntityQ321119· pop 43· linked from 366 articlesidentity functionSign in to savefunction that always returns the same value that was used as its argumentConnectionsfunctionEntitycomplex analysisEntitymorphismEntitymathematicsEntityInternational Standard Book NumberEntityintegerEntityset theoryEntitynumber theoryEntityreal numberEntitysetEntitydigital object identifierEntitysymmetryEntityvector spaceEntitypolynomialEntitysequenceEntitycontinuous functionEntitymetric spaceEntityinverse functionEntitygraph of a functionEntitytopological spaceEntityCategories1 (number)Basic concepts in set theoryElementary mathematicsFunctions and mappingsTypes of functions