Luca Aceto, Wan Fokkink, Anna Ingólfsdóttir. On a question of A. Salomaa: The equational theory of regular expressions over a singleton alphabet is not finitely based. Theoretical Computer Science, 209(1):163-178, 1998.
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Luca Aceto
Wan Fokkink
Anna Ingólfsdóttir
@article{afi98,
Author = {Aceto, Luca and Fokkink, Wan and Ingólfsdóttir, Anna},
Title = {On a question of {A. Salomaa}: The equational theory of regular expressions over a singleton alphabet is not finitely based},
Journal = {Theoretical Computer Science},
Volume = {209},
Number = {1},
Pages = {163--178},
Year = {1998}
}
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