Example image of eyePlorer eyePlorer map for 'Cardinality': Element (mathematics) Mathematics Set (mathematics) Bijection Cardinal number Injective function Absolute value Ambiguity Vertical bar Function (mathematics) Surjective function Negative and non-negative numbers Parity (mathematics) Natural number Cantor's diagonal argument Real number Class (set theory) Equinumerosity Equivalence relation Equivalence class Von Neumann cardinal assignment Set theory Ordinal number Aleph number Cardinality of the continuum Continuum hypothesis Axiom of choice Trichotomy (mathematics) Finite set Countable set Uncountable set Infinite set Euclid Georg Cantor Gottlob Frege Richard Dedekind Hilbert's paradox of the Grand Hotel Multiset Dedekind-infinite set Subset Zermelo–Fraenkel set theory Line segment Real line Interval Trigonometric functions Giuseppe Peano Hypercube Space-filling curve Cantor's theorem Power set