Nuprl Lemma : subtype_rel_product
0,22
postcript
pdf
A
:Type,
B
:(
A
Type),
C
:Type,
D
:(
C
Type).
A
C
(
a
:
A
.
B
(
a
)
D
(
a
))
(
a
:
A
B
(
a
))
(
c
:
C
D
(
c
))
latex
Definitions
x
:
A
.
B
(
x
)
,
t
T
,
S
T
,
x
(
s
)
,
P
Q
origin
A:Type, B:(A
Type), C:Type, D:(CType).
C 
(a:A. B(a) D(a)) (a:A
B(a)) (c:CD(c)) A:Type, B:(AType), C:Type, D:(CType).
C (a:A. B(a) D(a)) (a:AB(a)) (c:CD(c)) x:A. B(x)
T T Q