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def definition def or abbrev

shiftedCompose

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formal statement (Lean)

 225def shiftedCompose (A B : ShiftedCarrier) : ShiftedCarrier := by

proof body

Definition body.

 226  refine ⟨2 * A.1 * B.1, ?_⟩
 227  nlinarith [A.2, B.2]
 228
 229instance : Mul ShiftedCarrier := ⟨shiftedCompose⟩
 230
 231/-- The identity element `1/2` for the shifted monoid. -/

depends on (7)

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