BabelNet

bn:03300835n

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In set theory, a code for a hereditarily countable set x ∈ H ℵ 1 {\displaystyle x\in H_{\aleph _{1}}\,} is a set E ⊂ ω × ω {\displaystyle E\subset \omega \times \omega } such that there is an isomorphism between and where X is the transitive closure of {x}. Wikipedia

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