# Notes on kAExp(pol) problems for deterministic machines

The complexity of several logics, such as Presburger arithmetic, dependence logics and ambient logics, can only be characterised in terms of alternating Turing machines. Despite quite natural, the presence of alternation can sometimes cause neat ideas to be obfuscated inside heavy technical machinery. In these notes, we propose two problems on deterministic machines that can be used to prove lower bounds with respect to the computational class kAExp_pol, that is the class of all problems solvable by an alternating Turing machine running in k exponential time and performing a polynomial amount of alternations, with respect to the input size. The first problem, called kAExp_pol-prenex TM problem, is a problem about deterministic Turing machines. The second problem, called the k-exp alternating multi-tiling problem, is analogous to the first one, but on tiling systems. Both problems are natural extensions of the TM alternation problem and the alternating multi-tiling problem proved AExp_pol-complete by L. Bozzelli, A. Molinari, A. Montanari and A. Peron in [GandALF, pp. 31-45, 2017]. The proofs presented in these notes follow the elegant exposition in A. Molinari's PhD thesis to extend these results from the case k = 1 to the case of arbitrary k.

READ FULL TEXT