Nuprl - Proof: list iso 2 3 1 1

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At: list iso 2 3 1 1

1. 'a : S
2. x : (

'a)

3. x' : 'a List
4. x = <

. if n<

||x'|| then x'[n] else arb('a) fi ,||x'||>

f:(

'a), n:

. if n<

||x'|| then x'[n] else arb('a) fi ,||x'||>

. if m<

n then f(m) else @

x:'a. true

fi ,n>

By:	On [4;2] Thin THEN StrongAuto THEN Try (Complete (Unfold `label` 0))

Generated subgoal:

1 2. x' : 'a List
  f:('a), n:.
  <n:. if n<||x'|| then x'[n] else arb('a) fi ,||x'||>
  =
  <m:. if m<n then f(m) else @x:'a. true fi ,n>
5 steps

About:

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