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At: it sum wf 1 3
1.  List
2. u : 
3. v :  List
4. it_sum(v)  
  it_sum(cons(u; v))  
By: RecUnfold `it_sum` 0 THEN Simp THEN StrongAuto

Generated subgoal:

1   it_sum(v)  
1 step

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(7steps total) PrintForm Definitions hol list 1 Sections HOLlib Doc