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fix(data/int/basic): move decidable theorems

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Leonardo de Moura 2014-12-17 18:27:39 -08:00
parent 5a2f81e962
commit 235894cec5
1 changed files with 4 additions and 6 deletions
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10
library/data/int/basic.lean
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@ -115,12 +115,6 @@ cases_on a
(if H : m' = n' then inl (congr_arg neg_succ_of_nat H) else
inr (take H1, H (neg_succ_of_nat_inj H1)))))
definition decidable_nonneg [instance] (a : ℤ) : decidable (nonneg a) := cases_on a _ _
definition decidable_le [instance] (a b : ℤ) : decidable (a ≤ b) := decidable_nonneg _
definition decidable_lt [instance] (a b : ℤ) : decidable (a < b) := decidable_nonneg _
theorem sub_nat_nat_of_ge {m n : ℕ} (H : m ≥ n) : sub_nat_nat m n = of_nat (m - n) :=
have H1 : n - m = 0, from le_imp_sub_eq_zero H,
calc
@ -652,6 +646,10 @@ infix <= := int.le
infix ≤ := int.le
infix < := int.lt
definition decidable_nonneg [instance] (a : ℤ) : decidable (nonneg a) := cases_on a _ _
definition decidable_le [instance] (a b : ℤ) : decidable (a ≤ b) := decidable_nonneg _
definition decidable_lt [instance] (a b : ℤ) : decidable (a < b) := decidable_nonneg _
/-
Other stuff.
TODO: pare down and clean up.