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• 10:51, 16 October 2026 Rongzhou talk contribs created page Set (Created page with "A '''set''' is an unordered collection of distinct '''elements'''.<ref>{{#cite:Q2194}}</ref> == Formal definition == According to [https://en.wikipedia.org/wiki/Morse%E2%80%93Kelley_set_theory Morse-Kelley set theory]: $$ \exists B: A \in B \iff A \text{ is a set} $$ <ref>{{#cite:Q2184}}</ref> == Defining a set == === Enumeration === A small finite set can be described by '''enumerating''' all its elements: $$ S=\{\text{Apple, Banana, Peaches}\} $$ Some infinit...")