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A lower bound RADO's sigma function for binary turing machines

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In this note we show how to construct some simply-configured N-state binary Turing machines that will start on a blank tape and eventually halt after printing a very large number of ones. The number of ones produced by these machines can be expressed analytically in terms of functional difference equation. The latter expression furnishes the best lower bound presently known for Rado's noncomputable function, Σ(N), when N ≫ 5.

Published in:

Switching Circuit Theory and Logical Design, 1964 Proceedings of the Fifth Annual Symposium on

Date of Conference:

11-13 Nov. 1964