ThmDex – An index of mathematical definitions, results, and conjectures.
Formulation F4638 on R477: Set finiteness is hereditary
F4638
Formulation 0
Let $X$ be a D17: Finite set such that
(i) $E \subseteq X$ is a D78: Subset of $X$
Then $E$ is a D17: Finite set.