Nuprl Lemma : iff_transitivity
9,38
postcript
pdf
P
,
Q
,
R
:
. (
P
Q
)
(
Q
R
)
(
P
R
)
latex
ProofTree
Definitions
t
T
,
P
Q
,
P
Q
,
P
Q
,
P
Q
,
,
x
:
A
.
B
(
x
)
Lemmas
iff
wf
origin
P,Q,R:
. (P 
Q) (Q R) (P R)
P,Q,R:. (P Q) (Q R) (P R)
T Q
Q Q Qx:A. B(x)