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Computing the inverse of a finite function

At: nsub surj least preimage total gen


  B:Type, e:(BB).
  IsEqFun(B;e (a:f:(a onto B), y:B. (least x:. (f(x)) e y a)


By: UnivCD


Generated subgoal:

1 1. B : Type
2. e : BB
3. IsEqFun(B;e)
4. a : 
5. f : a onto B
6. y : B
  (least x:. (f(x)) e y a

7 steps

About:
boolnatural_numberapplyfunctionuniversememberimpliesall
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(8steps total) PrintForm Definitions Lemmas DiscreteMath Sections DiscrMathExt Doc