On the Expressive Power of Higher-Order Pushdown Systems
We show that deterministic collapsible pushdown automata of second order can recognize a language that is not recognizable by any deterministic higher-order pushdown automaton (without collapse) of any order. This implies that there exists a tree generated by a second order collapsible pushdown syst...
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| Format: | Article |
| Language: | English |
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Logical Methods in Computer Science e.V.
2020-08-01
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| Series: | Logical Methods in Computer Science |
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| Online Access: | https://lmcs.episciences.org/6692/pdf |