Commit 2023-02-06 08:48 b5813cc1

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feat: port Topology.Order.Priestley (#2070)

Estimated changes

Modified Mathlib.lean

Created Mathlib/Topology/Order/Priestley.lean

added theorem exists_clopen_lower_of_not_le

added theorem exists_clopen_upper_of_not_le

added theorem exists_clopen_upper_or_lower_of_ne