Theorem IsLowerSet.preimage

Modification history

2026-04-08 16:40
Mathlib/Order/UpperLower/Basic.lean
chore: remove unneeded `to_dual existing` (#37778) …
Deleted IsLowerSet.preimageView on Github →
2023-02-01 07:36
Mathlib/Order/UpperLower/Basic.lean
feat: port Order.UpperLower.Basic (#1978)
Added IsLowerSet.preimageView on Github →