[Merged by Bors] - feat: weaken assumptions in lemmas about fderivWithin
#4330
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Forward-port leanprover-community/mathlib#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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This is a partial forward-port of leanprover-community/mathlib#19045. I only forward-ported 1 file that was already merged into `master`. I'll do some git history rewrites in pending PRs instead.
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fderivWithinfderivWithin
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…ommunity#4330) This is a partial forward-port of leanprover-community/mathlib#19045. I only forward-ported 1 file that was already merged into `master`. I'll do some git history rewrites in pending PRs instead.
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This is a partial forward-port of leanprover-community/mathlib#19045.
I only forward-ported 1 file that was already merged into
master. I'll do some git history rewrites in pending PRs instead.Files
Order.Filter.BasicandTopology.ContinuousOnare a part of the dependency.