## Conference paper

Publication language: HABERMEHL Peter, IOSIF Radu and VOJNAR Tomá¹. What else is decidable about integer arrays?. In: Foundations of Software Science and Computation Structures. Berlin: Springer Verlag, 2008, pp. 475-490. ISBN 978-3-540-78497-5. english What else is decidable about integer arrays? Co dále je rozhodnutelné o polích? 475-490 Foundations of Software Science and Computation Structures European Joint Conferences on Theory and Practice of Software -- ETAPS'08 (TACAS'08, FoSSaCS'08) LNCS 4962 Berlin, DE 2008 978-3-540-78497-5 Springer Verlag mathematical logic, arrays, decidability, decision procedure, formal verification, automata We introduce a new decidable logic for reasoning about infinite arrays of integers. The logic is in the $\exists^* \forall^*$ first-order fragment and allows (1) Presburger constraints on existentially quantified variables, (2) difference constraints as well as periodicity constraints on universally quantified indices, and (3) difference constraints on values. In particular, using our logic, one can express constraints on consecutive elements of arrays (e.g., $\forall i ~.~ 0 \leq i < n \rightarrow a[i+1]=a[i]-1$) as well as periodic facts (e.g., $\forall i ~.~ i \equiv_2 0 \rightarrow a[i] = 0$). The decision procedure follows the automata-theoretic approach: we translate formulae into a special class of B\"uchi counter automata such that any model of a formula corresponds to an accepting run of an automaton, and vice versa. The emptiness problem for this class of counter automata is shown to bedecidable as a consequence of earlier results on counter automata with a flat control structure and transitions based ondifference constraints. @INPROCEEDINGS{ author = {Peter Habermehl and Radu Iosif and Tom{\'{a}}{\v{s}} Vojnar}, title = {What else is decidable about integer arrays?}, pages = {475--490}, booktitle = {Foundations of Software Science and Computation Structures}, series = {LNCS 4962}, year = {2008}, location = {Berlin, DE}, publisher = {Springer Verlag}, ISBN = {978-3-540-78497-5}, language = {english}, url = {http://www.fit.vutbr.cz/research/view_pub.php?id=8574} }