[Merged by Bors] - feat(ring_theory/integral_domain): sum in integral domain indexed by finite group #2623
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…mathlib into sum_units_subgroup
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…finite group (#2623) In other words: nontrivial sums are trivial Moved from `field_theory.finite` to the new `ring_theory.integral_domain`: - `card_nth_roots_subgroup_units` - `subgroup_units_cyclic` Co-authored-by: Chris Hughes <chrishughes24@gmail.com>
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…finite group (leanprover-community#2623) In other words: nontrivial sums are trivial Moved from `field_theory.finite` to the new `ring_theory.integral_domain`: - `card_nth_roots_subgroup_units` - `subgroup_units_cyclic` Co-authored-by: Chris Hughes <chrishughes24@gmail.com>
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…finite group (leanprover-community#2623) In other words: nontrivial sums are trivial Moved from `field_theory.finite` to the new `ring_theory.integral_domain`: - `card_nth_roots_subgroup_units` - `subgroup_units_cyclic` Co-authored-by: Chris Hughes <chrishughes24@gmail.com>
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…finite group (leanprover-community#2623) In other words: nontrivial sums are trivial Moved from `field_theory.finite` to the new `ring_theory.integral_domain`: - `card_nth_roots_subgroup_units` - `subgroup_units_cyclic` Co-authored-by: Chris Hughes <chrishughes24@gmail.com>
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…r-community#2590) This PR adds some preparations for the Chevalley–Warning theorem. depends on: ~leanprover-community#2606, leanprover-community#2607, leanprover-community#2623~ Co-authored-by: Bryan Gin-ge Chen <bryangingechen@gmail.com>
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In other words: nontrivial sums are trivial
Moved from
field_theory.finiteto the newring_theory.integral_domain:card_nth_roots_subgroup_unitssubgroup_units_cyclic