Some Recursively Unsolvable Problems in ALGOL-Like Languages
Journal of the ACM (JACM)
Solvability of Machine Mappings of Regular Sets to Regular Sets
Journal of the ACM (JACM)
The Mathematical Theory of Context-Free Languages
The Mathematical Theory of Context-Free Languages
General properties of star height of regular events
Journal of Computer and System Sciences
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The following problem is shown to be decidable for arbitrary regular sets R"1 and R"2: Does there exist a generalized sequential machine with final states which maps R"1 onto R"2? In the development of the solution a graphical interpretation of bounded and unbounded regular sets is presented. Also, the subproblem when R"1 and R"2 are arbitrary bounded regular sets is shown to be decidable.