At:
paren order1
2
1
2
1
1.
T: Type
2.
s1: (T+T) List
3.
s2: (T+T) List
4.
i:T, s1@0,s2:(T+T) List. s1 = (s1@0 @ [inl(i)] @ s2) 
(inr(i) 
s2)
5.
i:T, s1,s2@0:(T+T) List. s2 = (s1 @ [inl(i)] @ s2@0) (inr(i) s2@0)
6.
paren(T;s1)
7.
paren(T;s2)
8.
i: T
9.
s1@0: (T+T) List
10.
s2@0: (T+T) List
11.
(s1 @ s2) = (s1@0 @ [inl(i)] @ s2@0)
12.
e: (T+T) List
13.
s1 = (s1@0 @ e)
14.
([inl(i)] @ s2@0) = (e @ s2)
15.
e1: (T+T) List
16.
e = ([inl(i)] @ e1)
17.
s2@0 = (e1 @ s2)
s1 = (s1@0 @ [inl(i)] @ e1)
By:
SubstFor s1 0
THEN
SubstFor e 0
Generated subgoals:
None
About:
