Nuprl Lemma : strong-subtype-ext-equal
11,40
postcript
pdf
A
,
B
:Type. (
B
r
A
)
(
A
r
B
)
strong-subtype(
A
;
B
)
latex
Definitions
x
:
A
.
B
(
x
)
,
P
Q
,
strong-subtype(
A
;
B
)
,
A
c
B
,
t
T
,
x
:
A
.
B
(
x
)
,
Lemmas
subtype
rel
wf
,
strong-subtype
wf
origin
A, B:Type. (B 
r A) 
(A r B) strong-subtype(A;B) A, B:Type. (B r A) (A r B) strong-subtype(A;B) x:A. B(x) Q
B
T
x:A. B(x)