English Function (mathematics) Cited by user David Eppstein on 16 Nov 2023 In mathematics, a function from a set X to a set Y assigns to each element of X exactly one element of Y.
English Reflection principle Cited by user 2601:547:501:8F90:60AE:7277:9C11:D708 on 08 Sep 2022 In set theory, a branch of mathematics, a reflection principle says that it is possible to find sets that, with respect to any given property, resemble the class of all…