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def definition def or abbrev

JAut

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 764def JAut : Type :=

proof body

Definition body.

 765  { f : PosReal → PosReal //
 766      (∀ x y : PosReal, f (posMul x y) = posMul (f x) (f y)) ∧
 767      (∀ x : PosReal, J (f x).1 = J x.1) }
 768
 769namespace JAut
 770
 771instance : CoeFun JAut (fun _ => PosReal → PosReal) := ⟨fun f => f.1⟩
 772
 773/-- Multiplicativity of a `J`-automorphism. -/

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