The Recursion Theorem and Infinite Sequences

Details The Recursion Theorem and Infinite Sequences The Recursion Theorem and Infinite Sequences

2008-01-14

arxiv.org/abs/0801.2097v1

Mathematics

Logic

Scientific paper

In this paper we use the Recursion Theorem to show the existence of various infinite sequences and sets. Our main result is that there is an increasing sequence e_0, e_1, e_2 .. such that W_{e_n}={e_{n+1}} for every n. Similarly, we prove that there exists an increasing sequence such that W_{e_n}={e_{n+1},e_{n+2},...} for every n. We call a nonempty computably enumerable set A self-constructing if W_e=A for every e in A. We show that every nonempty computable enumerable set which is disjoint from an infinite computable set is one-one equivalent to a self-constructing set

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