Contact (mathematics): Mathematics, Equivalence Relation, Function (mathematics), Derivative

Equivalence Class: class, Mathematics, Set (mathematics), relation, Subset, Equinumerosity, Surjective function, ... Map (mathematics),Epimorphism

Transitive Relation: Mathematics, Binary Relation, Set (Mathematics), Partial Order, Equivalence Relation

Quartic Function: Mathematics, Function (Mathematics), Polynomial, Equation, Derivative, Cubic Function, Nth Root,...

Symmetry in Mathematics: Symmetry, Mathematics, Geometry, Integral Transform, Equivalence Relation, Symmetric Function,...