EntityQ126955· pop 20· linked from 131 articleslevel setSign in to savesubset of a function's domain on which its value is equalConnectionscontour lineEntitymathematicsEntitycircleEntitysetEntitysphereEntitydigital object identifierEntityInternational Standard Serial NumberEntitytheoremEntitycoordinate systemEntitydimensionEntitycurveEntityempty setEntityconstantEntitygradientEntitymetric spaceEntitymanifoldEntitymathematical optimizationEntitymaxima and minimaEntityconvex setEntityQ22908627EntityCategoriesImplicit surface modelingMultivariable calculus