Nuprl Lemma : or_assoc
13,42
postcript
pdf
A
,
B
,
C
:
. (
A
(
B
C
))
((
A
B
)
C
)
latex
Up
core
2
,
core
2
Definitions
t
T
,
P
Q
,
P
Q
,
P
&
Q
,
P
Q
,
P
Q
,
,
x
:
A
.
B
(
x
)
Lemmas
rev
implies
wf
,
iff
wf
origin
A, B, C:
. (A 
(B C)) 
((A B) C) A, B, C:. (A (B C)) ((A B) C) 
T Q Q Q Qx:A. B(x)