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

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

Convex function: function, Mathematics, Function (mathematics), Subset, Interval (mathematics)

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

Concept Class: Boolean Function, Computational Learning Theory, Mathematics, Function (mathematics)