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Program schemes with deep pushdown storage.

Arratia-Quesada, A. and Stewart, I. A. (2008) 'Program schemes with deep pushdown storage.', in Logic and theory of algorithms. Berlin: Springer, pp. 11-21. Lecture notes in computer science. (5028).


Inspired by recent work of Meduna on deep pushdown automata, we consider the computational power of a class of basic program schemes, TeX, based around assignments, while-loops and non- deterministic guessing but with access to a deep pushdown stack which, apart from having the usual push and pop instructions, also has deep-push instructions which allow elements to be pushed to stack locations deep within the stack. We syntactically define sub-classes of TeX by restricting the occurrences of pops, pushes and deep-pushes and capture the complexity classes NP and PSPACE. Furthermore, we show that all problems accepted by program schemes of TeX are in EXPTIME.

Item Type:Book chapter
Keywords:Models of computation, Program schemes, Complexity classes.
Full text:(AM) Accepted Manuscript
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Record Created:02 Jul 2009 14:50
Last Modified:31 Mar 2015 12:41

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