Decision problems for patterns
Journal of Computer and System Sciences
A note on the equivalence problem of E-patterns
Information Processing Letters
Handbook of formal languages, vol. 1: word, language, grammar
Handbook of formal languages, vol. 1: word, language, grammar
Handbook of formal languages, vol. 1
Handbook of formal languages, vol. 1
On the equivalence problem for E-pattern languages
Theoretical Computer Science
Handbook of Formal Languages
Polynomial Time Inference of Extended Regular Pattern Languages
Proceedings of RIMS Symposium on Software Science and Engineering
The Relation of Two Patterns with Comparable Languages
STACS '88 Proceedings of the 5th Annual Symposium on Theoretical Aspects of Computer Science
Discontinuities in pattern inference
Theoretical Computer Science
Journal of Automata, Languages and Combinatorics
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We contribute new facets to the discussion on the equivalence problem for E-pattern languages (also referred to as extended or erasing pattern languages). This fundamental open question asks for the existence of a computable function that, given any pair of patterns, decides whether or not they generate the same language. Our main result disproves Ohlebusch and Ukkonen’s conjecture (Theoretical Computer Science 186, 1997) on the equivalence problem; the respective argumentation, that largely deals with the nondeterminism of pattern languages, is restricted to terminal alphabets with at most four distinct letters.