Nuprl Lemma : strong-subtype-eq4
11,40
postcript
pdf
A
,
B
:Type,
b
:
B
,
a
:
A
. strong-subtype(
B
;
A
)
{(
b
=
a
A
)
(
b
=
a
B
)}
latex
Definitions
x
:
A
.
B
(
x
)
,
P
Q
,
{
T
}
,
t
T
,
,
strong-subtype(
A
;
B
)
,
A
c
B
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)} x:A. B(x) Q T
B