EntityQ917661· pop 21· linked from 159 articlesdegeneracySign in to savelimiting case in which an element of a class of objects is qualitatively different from the rest of the classConnectionsmultiplicityEntitymathematicsEntitytriangleEntityquantum mechanicsEntitycircleEntityangleEntityvolumeEntityrectangleEntitylineEntitysphereEntitypolygonEntitypointEntitysymmetryEntityellipseEntitydimensionEntityplaneEntityparabolaEntitypolynomialEntityright triangleEntityconic sectionEntityCategoriesMathematical concepts