Nuprl Lemma : strong-subtype-eq4
0,22
postcript
pdf
A
,
B
:Type,
b
:
B
,
a
:
A
. strong-subtype(
B
;
A
)
{
b
=
a
A
b
=
a
B
}
latex
Definitions
A
&
B
,
{
T
}
,
P
Q
,
Prop
,
strong-subtype(
A
;
B
)
,
x
:
A
.
B
(
x
)
,
t
T
Lemmas
strong-subtype
wf
,
strong-subtype-eq2
origin
A, B:Type, b:B, a:A. strong-subtype(B;A) 
{b = a 
A b = a B} A, B:Type, b:B, a:A. strong-subtype(B;A) {b = a A b = a B} Qx:A. B(x) T