We show that the following problem is decidable: given expressions E1 and E2 constructed from variables by the regular operations and shuffle, is the identity E1 = E2 true for all...
Abstract. Multi-threaded programs with recursion are naturally modeled as multi-pushdown systems. The behaviors are represented as multiply nested words (MNWs), which are words enr...
In this paper we define a new clausal class, called BU, which can be decided by hyperresolution with splitting. We also consider the model generation problem for BU and show that h...
Lilia Georgieva, Ullrich Hustadt, Renate A. Schmid...
Many useful XML transformations can be formulated through deterministic top-down tree transducers. A canonical form for such transducers is presented which allows to decide equiva...