ThmDex – An index of mathematical definitions, results, and conjectures.
▼ Set of symbols
▼ Alphabet
▼ Deduction system
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▼ Zermelo-Fraenkel set theory
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▼ Singleton set
Definition D3835
Duoton set
Formulation 0
A D11: Set $X$ is a duoton set if and only if \begin{equation} |X| = 2 \end{equation}
Children
▶ D5042: Trioton set