Nuprl Lemma : subtype_rel_function
0,22
postcript
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A
,
B
,
C
,
D
:Type.
C
A
B
D
(
A
B
)
(
C
D
)
latex
Definitions
P
Q
,
S
T
,
S
T
,
x
:
A
.
B
(
x
)
,
t
T
origin
A, B, C, D:Type. C 
A 
B D (A
B) (CD) A, B, C, D:Type. C A B D (AB) (CD) Q
T Tx:A. B(x)
T