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At: member iff sublist 1

1. T : Type
2. x : T
3. L : T List
4. i : 
5. i<||L||
6. x = L[i]
  f:(1||L||). increasing(f;1) & (j:1. [x][j] = L[(f(j))])


By: InstConcl [x.i] THEN Try (Unfold `label` 0 THEN Reduce 0)


Generated subgoals:

1   increasing(x.i;1)
1 step
2 7. j : 1
  [x][j] = L[((x.i)(j))]

1 step

About:
listconsnilnatural_numberless_thanlambdaapply
functionuniverseequalandallexists
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(6steps total) PrintForm Definitions mb list 1 Sections MarkB generic Doc