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chore(builtin/sum): cleanup

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2014-02-06 21:25:57 -08:00
parent d4b08fcf96
commit 354d5607af
1 changed files with 4 additions and 4 deletions
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8
src/builtin/sum.lean
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@ -16,7 +16,7 @@ namespace sum
theorem inl_pred {A : (Type U)} (a : A) (B : (Type U)) : sum_pred A B (pair (some a) none)
:= not_intro
(assume N : (some a = none) = (none = (@none B)),
have eq : some a = none,
have eq : some a = none,
from (symm N) ◂ (refl (@none B)),
show false,
from absurd eq (distinct a))
@ -24,7 +24,7 @@ theorem inl_pred {A : (Type U)} (a : A) (B : (Type U)) : sum_pred A B (pair (som
theorem inr_pred (A : (Type U)) {B : (Type U)} (b : B) : sum_pred A B (pair none (some b))
:= not_intro
(assume N : (none = (@none A)) = (some b = none),
have eq : some b = none,
have eq : some b = none,
from N ◂ (refl (@none A)),
show false,
from absurd eq (distinct b))
@ -55,10 +55,10 @@ theorem inl_inj {A B : (Type U)} {a1 a2 : A} : inl a1 B = inl a2 B → a1 = a2
from optional::injectivity
(calc some a1 = proj1 (pair (some a1) (@none B)) : refl (some a1)
... = proj1 (pair (some a2) (@none B)) : pair_inj1 rep_eq
... = some a2 : refl (some a2))
... = some a2 : refl (some a2))
theorem inr_inj {A B : (Type U)} {b1 b2 : B} : inr A b1 = inr A b2 → b1 = b2
:= assume Heq : inr A b1 = inr A b2,
:= assume Heq : inr A b1 = inr A b2,
have eq1 : inr A b1 = abst (pair none (some b1)) (inhabr A (inhabited_intro b1)),
from refl (inr A b1),
have eq2 : inr A b2 = abst (pair none (some b2)) (inhabr A (inhabited_intro b1)),