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help show , we use the s-m-n theorem (Theorem 2.1) to define two limiting-recursive functions g and h as follows. For each i and x define: |
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Since l i.Ti is limiting recursive, it follows that one can construct a limiting-recursive g as above. For each , define |
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and, for each i > k, define |
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Since l i.con(i, k), f, and g are limiting-recursive, it follows that one can construct a limiting-recursive h as above. (Note: One cannot, in general, limiting-recursively decide whether Q k( j f(i)) is total. But this is not a difficulty since (13.1) affects only finitely many values of h.) |
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(a) For each i, if con(i, k), then s g(i) is consistent with Q k( j f(i)). |
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(c) For each j > i, . |
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Proof: By Claim 13.6(C) for , we have that con(i, k) implies |
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Since , part (a) follows from the definition of g. |
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Part (b) follows from part (a) and definition of h. |
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For part (c), first note that, for , we have by (13.1) that j h(i) is total, and hence, for such , part (c) clearly holds. So assume i > k and suppose j h(i) ~ j h(j). By |
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