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At: list append ind

  T:Type, Q:((T List)Prop).
  Q(nil)
  
  (x:TQ([x]))
  
  (ys,ys':T List. Q(ys Q(ys' Q(ys @ ys'))  (zs:T List. Q(zs))


By: Unfold `guard` 0 THEN RepD


Generated subgoal:

1 1. T : Type
2. Q : (T List)Prop
3. Q(nil)
4. x:TQ([x])
5. ys,ys':T List. Q(ys Q(ys' Q(ys @ ys')
6. zs : T List
  Q(zs)

3 steps

About:
listconsnilfunctionuniversepropimpliesall
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(4steps total) PrintForm Definitions list 1 Sections StandardLIB Doc