Nuprl Lemma : hd_wf_listp
4,23
postcript
pdf
A
:Type,
l
:
A
List
. hd(
l
)
A
latex
Definitions
t
T
,
x
:
A
.
B
(
x
)
,
A
List
,
||
as
||
,
P
Q
,
False
,
A
,
A
B
,
i
j
,
hd(
l
)
Lemmas
listp
properties
,
hd
wf
,
listp
wf
origin
A:Type, l:A List
. hd(l) 
A A:Type, l:A List. hd(l) A Tx:A. B(x)
Q
A
B
j