Nuprl Lemma : null_wf
11,40
postcript
pdf
T
:Type,
as
:(
T
List). null(
as
)
latex
Definitions
null(
as
)
,
t
T
,
x
:
A
.
B
(
x
)
Lemmas
bfalse
wf
,
btrue
wf
origin
T:Type, as:(T List). null(as) 
T:Type, as:(T List). null(as) Tx:A. B(x)