`BookProof.ChapterIPin.ipin_left` (Λ : P →* Multiplicative (AddAut V)) (x y : IPin Λ) : toAdd (x * y).left = toAdd x.left + Multiplicative.toAdd (Λ x.right) (toAdd y.left)

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`BookProof.ChapterIPin.ipin_left` (Λ : P →* Multiplicative (AddAut V)) (x y : IPin Λ) : toAdd (x * y).left = toAdd x.left + Multiplicative.toAdd (Λ x.right) (toAdd y.left) · Prove2Me