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Axel Thue
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==Work== Thue published his first important paper in 1909.<ref name=Bio>{{MacTutor Biography|id=Thue}}</ref> He stated in 1914 the so-called [[Semi-Thue_system#The_word_problem_for_semi-Thue_systems|word problem for semigroups]] or Thue problem, closely related to the [[halting problem]].<ref>[[Ronald V. Book]] and Friedrich Otto, ''String-rewriting Systems'', Springer, 1993, {{isbn|0-387-97965-4}}, p. 36.</ref> His only known PhD student was [[Thoralf Skolem]]. The esoteric programming language Thue is named after him.
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