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[Merged by Bors] - feat(order/filter/basic): generalize some lemmas from nhds_within#19070
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[Merged by Bors] - feat(order/filter/basic): generalize some lemmas from nhds_within#19070
nhds_within#19070Conversation
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nhds_withinnhds_within
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May 25, 2023
Forward-port leanprover-community/mathlib3#19070: - add `Filter.set_eventuallyLE_iff_mem_inf_principal`, `Filter.set_eventuallyLE_iff_inf_principal_le`, and `Filter.set_eventuallyEq_iff_inf_principal`; - golf `nhdsWithin_eq_iff_eventuallyEq` and `nhdsWithin_le_iff`. The original PR golfs one more lemma which was already golfed to 1 line in Mathlib 4.
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May 25, 2023
Forward-port leanprover-community/mathlib3#19070: - add `Filter.set_eventuallyLE_iff_mem_inf_principal`, `Filter.set_eventuallyLE_iff_inf_principal_le`, and `Filter.set_eventuallyEq_iff_inf_principal`; - golf `nhdsWithin_eq_iff_eventuallyEq` and `nhdsWithin_le_iff`. The original PR golfs one more lemma which was already golfed to 1 line in Mathlib 4.
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