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Add missing 4.2 definition #429

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teorth merged 1 commit into from
Jan 11, 2026
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Add missing 4.2 definition #429

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3 changes: 3 additions & 0 deletions analysis/Analysis/Section_4_2.lean
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Expand Up @@ -237,6 +237,9 @@ instance Rat.instField : Field Rat where

example : (3//4) / (5//6) = 9 // 10 := by sorry

/-- Definition of subtraction -/
theorem Rat.sub_eq (a b:Rat) : a - b = a + (-b) := by rfl

def Rat.coe_int_hom : ℤ →+* Rat where
toFun n := (n:Rat)
map_zero' := rfl
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