Nuprl Lemma : first_wf
11,40
postcript
pdf
E
:Type,
pred?
:(
E
(
E
+ top)),
e
:
E
. first(
e
)
latex
Definitions
Type
,
t
T
,
top
,
left
+
right
,
x
:
A
B
(
x
)
,
f
(
a
)
,
x
:
A
.
B
(
x
)
,
isl(
x
)
,
b
,
first(
e
)
Lemmas
bnot
wf
,
isl
wf
,
top
wf
origin
E:Type, pred?:(E
(E + top)), e:E. first(e) 
E:Type, pred?:(E(E + top)), e:E. first(e) TB(x)x:A. B(x)
b