feat: port Algebra.DirectSum.Basic (#1923)

Needed to add some instance names in Dfinnsup/Basic because the standard ones were insanely long. Could extract that to a separate PR, but maybe that's not needed. Co-authored-by: ChrisHughes24 <chrishughes24@gmail.com>
leanprover-community · Jan 30, 2023 · d16fa2f · d16fa2f
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diff --git a/Mathlib.lean b/Mathlib.lean
@@ -17,6 +17,7 @@ import Mathlib.Algebra.CharZero.Defs
 import Mathlib.Algebra.CharZero.Infinite
 import Mathlib.Algebra.CharZero.Lemmas
 import Mathlib.Algebra.CovariantAndContravariant
+import Mathlib.Algebra.DirectSum.Basic
 import Mathlib.Algebra.Divisibility.Basic
 import Mathlib.Algebra.Divisibility.Units
 import Mathlib.Algebra.EuclideanDomain.Basic