(35steps total) PrintForm Definitions Lemmas DiscreteMath Sections DiscrMathExt Doc
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At: nsub inj exteq nsub surj 1 1 1 1 1 1 1 1 1

1. k : 
2. f : k inj k
3. f  kk
4. Inj(k; k; f)
5. b : k
6. (a:k. f(a) = b)
  f  k inj {y:k| y = b }


By: f  k{y:k| y = b   }  Asserted THEN Analyze


Generated subgoals:

1   f  k{y:k| y = b }
4 steps
2 7. f  k{y:k| y = b }
  Inj(k; {y:k| y = b }; f)

2 steps

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

(35steps total) PrintForm Definitions Lemmas DiscreteMath Sections DiscrMathExt Doc