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1 record

theoremLean 4v1

List filtering preserves exactly matching members

An element belongs to a filtered Lean list exactly when it belongs to the input and the Boolean predicate holds. Useful for membership and input-origin arguments.

listfiltermembershipsubsetselectionpredicate

not checked by us · Semantic: unreviewed · Correspondence: none

Catalogue snapshot fc348a2252e7 · source 5d5248f24dd7
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