Nuprl Lemma : es-interface-conditional
11,40
postcript
pdf
es
:ES,
A
:Type,
I1
,
I2
:AbsInterface(
A
). [
I1
?
I2
]
AbsInterface(
A
)
latex
Definitions
AbsInterface(
A
)
,
[
f
?
g
]
,
x
.
A
(
x
)
,
if
b
then
t
else
f
fi
,
can-apply(
f
;
x
)
,
suptype(
S
;
T
)
,
f
(
a
)
,
S
T
,
x
:
A
.
B
(
x
)
,
Void
,
x
:
A
B
(
x
)
,
E
,
x
:
A
.
B
(
x
)
,
left
+
right
,
Top
,
Type
,
t
T
,
ES
Lemmas
event
system
wf
,
top
wf
,
es-E
wf
,
can-apply
wf
,
ifthenelse
wf
origin
es:ES, A:Type, I1, I2:AbsInterface(A). [I1?I2] 
AbsInterface(A) es:ES, A:Type, I1, I2:AbsInterface(A). [I1?I2] AbsInterface(A) 
x.A(x)
T
x:A.B(x)
B(x)x:A. B(x) T