CARDINALITY
\kˌɑːdɪnˈalɪti], \kˌɑːdɪnˈalɪti], \k_ˌɑː_d_ɪ_n_ˈa_l_ɪ_t_i]\
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The number of elements in a set. If two setshave the same number of elements (i.e. there is a bijectionbetween them) then they have the same cardinality. Acardinality is thus an isomorphism class in the categoryof sets.aleph 0 is defined as the cardinality of the firstinfinite ordinal, omega (the number of naturalnumbers).
By Denis Howe
