NDLI: The degree diagram of undecidable problems of formal grammars

Content Provider	ACM Digital Library
Author	Cudia, Dennis F.
Abstract	Let O be the degree of all solvable problems, let O' be the degree of unsolvability of the halting problem for Turing machines, let O'' be the degree of unsolvability of the problem of whether an arbitrary Turing machine eventually halts for only finitely many finite initial configurations, and let O''' be the degree of unsolvability of the problem of whether an arbitrary Turing machine never halts for only finitely many finite initial configurations. Let ≤ denote the partial ordering of Turing reducibility. Then using results and methods of 1. and 2., the following degree diagram refinement of a table of solvable and unsolvable problems, which appears in 3., p. 230, may be obtained.
Starting Page	7
Ending Page	8
Page Count	2
File Format	PDF
ISSN	01635700
DOI	10.1145/1247043.1247045
Journal	ACM SIGACT News (SIGA)
Issue Number	3
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1992-06-30
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article

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The degree diagram of undecidable problems of formal grammars