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We are concerned with the synthesis of strategies for sequential decision-making in nondeterministic dynamical environments where the objective is to satisfy a prescribed temporally extended goal. We frame this task as a Fully Observable Non-Deterministic planning problem with the goal expressed in Linear Temporal Logic (LTL), or LTL interpreted over finite traces (LTLf ). While the problem is well-studied theoretically, existing algorithmic solutions typically compute so-called strong-cyclic solutions, which are predicated on an assumption of fairness. In this paper we introduce novel algorithms to compute so-called strong solutions, that guarantee goal satisfaction even in the absence of fairness. Our strategy generation algorithms are complemented with novel mechanisms to obtain proofs of unsolvability. We implemented and evaluated the performance of our approaches in a selection of domains with LTL and LTLf goals.

Strong Fully Observable Non-Deterministic Planning with LTL and LTLf Goals