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refactor(hott,library): make sure files compile even without using "projection macros"

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This commit is contained in:
Leonardo de Moura 2015-06-22 12:22:11 -07:00
parent 76477aedd1
commit cfafc90cc0
2 changed files with 4 additions and 2 deletions
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3
hott/algebra/group.hlean
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@ -410,7 +410,8 @@ section add_group
theorem sub_zero (a : A) : a - 0 = a := subst (eq.symm neg_zero) !add_zero
theorem sub_neg_eq_add (a b : A) : a - (-b) = a + b := !neg_neg ▸ rfl
theorem sub_neg_eq_add (a b : A) : a - (-b) = a + b :=
by change a + -(-b) = a + b; rewrite neg_neg
theorem neg_sub (a b : A) : -(a - b) = b - a :=
neg_eq_of_add_eq_zero

3
library/algebra/group.lean
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@ -433,7 +433,8 @@ section add_group
theorem sub_zero (a : A) : a - 0 = a := subst (eq.symm neg_zero) !add_zero
theorem sub_neg_eq_add (a b : A) : a - (-b) = a + b := !neg_neg ▸ rfl
theorem sub_neg_eq_add (a b : A) : a - (-b) = a + b :=
by change a + -(-b) = a + b; rewrite neg_neg
theorem neg_sub (a b : A) : -(a - b) = b - a :=
neg_eq_of_add_eq_zero