Nuprl Lemma : hd_l_interval
0,22
postcript
pdf
T
:Type,
l
:
T
List,
i
:
||
l
||,
j
:
i
. hd(l_interval(
l
;
j
;
i
)) =
l
[
j
]
T
latex
Definitions
P
Q
,
P
Q
,
i
j
<
k
,
A
,
False
,
P
Q
,
A
B
,
Prop
,
T
,
True
,
P
&
Q
,
i
j
,
i
<
j
,
hd(
l
)
,
l
[
i
]
,
l_interval(
l
;
j
;
i
)
,
{
i
..
j
}
,
||
as
||
,
x
:
A
.
B
(
x
)
,
t
T
Lemmas
length
wf1
,
int
seg
wf
,
le
wf
,
squash
wf
,
select
wf
,
select
l
interval
origin
T:Type, l:T List, i:
||l||, j:i. hd(l_interval(l;j;i)) = l[j] 
T T:Type, l:T List, i:||l||, j:i. hd(l_interval(l;j;i)) = l[j] T 
Q
Q
j < k
A QB
T
jj
}x:A. B(x) T