Nuprl Lemma : member_exists
11,40
postcript
pdf
T
:Type,
L
:(
T
List). (
(
L
= []))
(
x
:
T
. (
x
L
))
latex
Definitions
prop{i:l}
,
False
,
A
B
,
t
T
,
A
c
B
,
,
(
x
l
)
,
x
:
A
.
B
(
x
)
,
A
,
P
Q
,
x
:
A
.
B
(
x
)
Lemmas
not
wf
,
nat
wf
,
length
wf1
,
le
wf
,
select
wf
,
non
nil
length
origin
T:Type, L:(T List). (
(L = [])) 
(
x:T. (x 
L)) T:Type, L:(T List). ((L = [])) (x:T. (x L)) 
B T
B
l)x:A. B(x)A Qx:A. B(x)