(4steps total)
PrintForm
Definitions
DiscreteMath
Sections
DiscrMathExt
Doc
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
left
inv
of
surj
is
right
inv
1
1
1.
A
: Type
2.
B
: Type
3.
f
:
A
B
4.
g
:
B
A
5. Surj(
A
;
B
;
f
)
6.
x
:
A
.
g
(
f
(
x
)) =
x
7.
y
:
B
8.
a
:
A
9.
f
(
a
) =
y
f
(
g
(
y
)) =
y
By:
Rewrite by Hyp:9
Generated subgoal:
1
f
(
g
(
f
(
a
))) =
f
(
a
)
1
step
About:
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
(4steps total)
PrintForm
Definitions
DiscreteMath
Sections
DiscrMathExt
Doc
B
x:A. g(f(x)) = x
f(g(y)) = y
