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Merge branch 'master' into Tensors

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Joseph Tooby-Smith 2024-07-19 16:27:19 -04:00 • committed by GitHub
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HepLean/SpaceTime/LorentzTensor/Real/Multiplication.lean
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@ -166,7 +166,7 @@ lemma mul_markedLorentzAction (T : Marked d X 1) (S : Marked d Y 1)
T.coord (splitIndexValue.symm ((indexValueSumEquiv i).1, j))
* S.coord (splitIndexValue.symm ((indexValueSumEquiv i).2, k))
apply Finset.sum_congr rfl (fun x _ => ?_)
rw [Finset.sum_mul_sum ]
rw [Finset.sum_mul_sum]
apply Finset.sum_congr rfl (fun j _ => ?_)
apply Finset.sum_congr rfl (fun k _ => ?_)
ring