IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
nsub surj least preimage works b,a:, f:(a onto b), y:b. f(least x:. f(x)=y) = y
By:
Analyze
THEN
Use:[B:= b | e(i;j):= i=j]
Inst:
Thm*e:(BB).
Thm* IsEqFun(B;e) (a:, f:(a onto B), y:B. f(least x:. (f(x)) ey) = y)
THEN
BackThru: Thm* IsEqFun(b;i,j. i=j)
Generated subgoals:
None
About:
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html