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formal statement (Lean)
65inductive Sign : Type
66 | neg : Sign
67 | zero : Sign
68 | pos : Sign
69 deriving DecidableEq, Repr
70
71/-- Sign is nonempty -/
72instance : Nonempty Sign := ⟨Sign.zero⟩
proof body
Definition body.
73
74/-- The sign function -/
used by (13)
From the project-wide theorem graph. These declarations reference this one in their body.
depends on (9)
Lean names referenced from this declaration's body.
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