(5steps total)
PrintForm
Definitions
Lemmas
DiscreteMath
Sections
DiscrMathExt
Doc
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
surjection
type
nsub
surjection
1
1.
a
:
2.
b
:
3.
f
:
a
onto
b
Surj(
a
;
b
;
f
)
By:
Use:[
a
|
b
|
f
|
a
]
Inst:
Thm*
f
:(
A
onto
B
),
a
:
.
a
onto
A
(
B
Discrete)
Surj(
A
;
B
;
f
)
Generated subgoals:
1
a
onto
a
2
steps
2
b
Discrete
1
step
About:
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
(5steps total)
PrintForm
Definitions
Lemmas
DiscreteMath
Sections
DiscrMathExt
Doc
a onto
b
Surj(a; b; f)
a onto b
Surj(a; b; f)a | b | f | a]
f:(A onto B), a:. a onto A 
(B Discrete) Surj(A; B; f) a onto a
b Discrete
