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Update PermContr.lean
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pitmonticone committed Jan 13, 2025
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2 changes: 1 addition & 1 deletion HepLean/Tensors/Tree/NodeIdentities/PermContr.lean
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Expand Up @@ -245,7 +245,7 @@ namespace TensorTree
variable {S : TensorSpecies}

/-- Permuting indices, and then contracting is equivalent to contracting and then permuting,
once care is taking about ensuring one is contracting the same idices. -/
once care is taking about ensuring one is contracting the same indices. -/
lemma perm_contr {n : ℕ} {c : Fin n.succ.succ → S.C} {c1 : Fin n.succ.succ → S.C}
{i : Fin n.succ.succ} {j : Fin n.succ}
{h : c1 (i.succAbove j) = S.τ (c1 i)} (t : TensorTree S c)
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