PrintForm Definitions Lemmas DiscreteMath Sections DiscrMathExt Doc
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:bf(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:Bf(least x:. (f(x)) e y) = y)
THEN
BackThru: Thm*  IsEqFun(b;i,ji=j)


Generated subgoals:

None

About:
boolnatural_numberapplyfunctionuniverseequalimpliesall
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

PrintForm Definitions Lemmas DiscreteMath Sections DiscrMathExt Doc