(9steps total) PrintForm Definitions Lemmas DiscreteMath Sections DiscrMathExt Doc
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At: nsub bij least preimage inverse 1 1 1 1 1 1

1. a : 
2. f : a bij a
3. f  a onto a
4. f  aa
5. Bij(aaf)
6. (y.least x:f(x)=y aa
7. Inj(aay.least x:f(x)=y)
8. x : a
9. f(least x@0:f(x@0)=f(x)) = f(x)
  Inj(aaf)


By: BackThru: Bij(aaf)


Generated subgoals:

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

(9steps total) PrintForm Definitions Lemmas DiscreteMath Sections DiscrMathExt Doc