On pebble automata for data languages with decidable emptiness problem
On pebble automata for data languages with decidable emptiness problem
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DOI:
10.1007/978-3-642-03816-7_60
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发表时间:
2009-08
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通讯作者:
Tony Tan
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文献类型:
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作者:
Tony Tan
In this paper we study a subclass of pebble automata (PA) for data languages for which the emptiness problem is decidable. Namely, we show that the emptiness problem for weak 2-pebble automata is decidable, while the same problem for weak 3-pebble automata is undecidable. We also introduce the so-calledtop viewweak PA. Roughly speaking, top view weak PA are weak PA where the equality test is performed only between the data values seen by the two most recently placed pebbles. The emptiness problem for this model is still decidable.