Nuprl Lemma : filter_wf
11,40
postcript
pdf
T
:Type,
P
:(
T
),
l
:(
T
List). filter(
P
;
l
)
(
T
List)
latex
Definitions
t
T
,
x
:
A
.
B
(
x
)
,
filter(
P
;
l
)
Lemmas
bool
wf
,
ifthenelse
wf
,
reduce
wf
origin
T:Type, P:(T
), l:(T List). filter(P; l) 
(T List) T:Type, P:(T), l:(T List). filter(P; l) (T List) Tx:A. B(x)