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def definition def or abbrev

one

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formal statement (Lean)

 117def one : LogicRat :=

proof body

Definition body.

 118  mk 1 1 (by
 119    intro h
 120    have : toInt (1 : LogicInt) = toInt (0 : LogicInt) := congrArg toInt h
 121    rw [toInt_one, toInt_zero] at this
 122    exact one_ne_zero this)
 123
 124instance : Zero LogicRat := ⟨zero⟩
 125instance : One LogicRat := ⟨one⟩
 126
 127/-- Negation: `-(a/b) = (-a)/b`. -/

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