Theorems · Theorem · number theory

Finset.addETransformRight.card

∀ {α : Type u_1} [inst : DecidableEq α] [inst_1 : AddGroup α] (e : α) (x : Finset α × Finset α),
  (Finset.addETransformLeft e x).2.card + (Finset.addETransformRight e x).2.card = 2 * x.2.card

Defined in

Mathlib.Combinatorics.Additive.ETransform

Cited by

1 results in Mathlib

Foundations

Depth 78 from the axioms · uses propext, Classical.choice, Quot.sound

Assumes

DecidableEqAddGroup