Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-05-23 10:20 15f49ae2

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feat(linear_algebra/tensor_algebra/basic): add tensor_algebra.tprod (#14197) This is related to exterior_power.ι_multi. Note the new import caused a proof to time out, so I squeezed the simps into term mode.

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