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