Acta Informatica

, Volume 44, Issue 2, pp 75–90 | Cite as

Decision problems for pushdown threads

  • Jan A. Bergstra
  • Inge Bethke
  • Alban PonseEmail author
Open Access
Original Article


Threads as contained in a thread algebra emerge from the behavioral abstraction from programs in an appropriate program algebra. Threads may make use of services such as stacks, and a thread using a single stack is called a pushdown thread. Equivalence of pushdown threads is shown decidable whereas pushdown thread inclusion is undecidable. This is again an example of a borderline crossing where the equivalence problem is decidable, whereas the inclusion problem is not.


External Action Equivalence Problem Inclusion Problem Logic Algebraic Reply Function 
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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.Faculty of Science, Programming Research GroupUniversity of AmsterdamAmsterdamThe Netherlands
  2. 2.Utrecht UniversityDepartment of Philosophy, Applied Logic GroupUtrechtThe Netherlands

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