Nuprl Lemma : inv-rel-inject
0,22
postcript
pdf
A
,
B
:Type,
f
:(
A
B
),
finv
:(
B
(
A
+Unit)). inv-rel(
A
;
B
;
f
;
finv
)
Inj(
A
;
B
;
f
)
latex
Definitions
t
T
,
Unit
,
Prop
,
x
:
A
.
B
(
x
)
,
P
Q
,
P
&
Q
,
Inj(
A
;
B
;
f
)
,
inv-rel(
A
;
B
;
f
;
finv
)
Lemmas
unit
wf
origin
A, B:Type, f:(A
B), finv:(B(A+Unit)). inv-rel(A;B;f;finv) 
Inj(A; B; f) A, B:Type, f:(AB), finv:(B(A+Unit)). inv-rel(A;B;f;finv) Inj(A; B; f) 
Tx:A. B(x) Q