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feat(order/filter,topology/instances/nnreal): upgrade some lemmas to <code>iff</code>

awaiting-authorA reviewer has asked the author a question or requested changesA reviewer has asked the author a question or requested changes

modifies-synchronized-fileThis PR touches a files that has already been ported to mathlib4, and may need a synchronization PR.This PR touches a files that has already been ported to mathlib4, and may need a synchronization PR.

t-orderOrder hierarchyOrder hierarchy

t-topologyTopological spaces, uniform spaces, metric spaces, filtersTopological spaces, uniform spaces, metric spaces, filters

too-lateThis PR was ready too late for inclusion in mathlib3This PR was ready too late for inclusion in mathlib3

Status: Open (in progress).

leanprover-community/mathlib3number 18964

#18964 In leanprover-community/mathlib3;

· urkud opened on May 7, 2023

feat(ring_theory/integral_domain): generalize <code>card_fiber_eq_of_mem_range</code>

awaiting-authorA reviewer has asked the author a question or requested changesA reviewer has asked the author a question or requested changes

modifies-synchronized-fileThis PR touches a files that has already been ported to mathlib4, and may need a synchronization PR.This PR touches a files that has already been ported to mathlib4, and may need a synchronization PR.

t-algebraAlgebra (groups, rings, fields etc)Algebra (groups, rings, fields etc)

too-lateThis PR was ready too late for inclusion in mathlib3This PR was ready too late for inclusion in mathlib3

Status: Open (in progress).

leanprover-community/mathlib3number 17653

#17653 In leanprover-community/mathlib3;

· urkud opened on Nov 20, 2022