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This paper presents groundbreaking insights into partially ordered 2-way deterministic timed automata (po2DTA) and their equivalence to Timed-Unambiguous Interval Logic (T-UIL). We introduce the concept of a small model for po2DTA, demonstrating that an n-state po2DTA has a model size of at most n^2. We explore the complexities of satisfiability, revealing NP-completeness for T-UIL and PSPACE membership for reversal-bounded structures. Additionally, we address challenges in logical characterizations and undecidability of certain complementations, enriching the understanding of timed automata and their applications in real-time systems.
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(Paritosh Pandya, Simoni Shah) NEW INSIGHTS IMPACT STATUS QUO LONG TERM GOALS Unambiguity In Time We introduce Partially Ordered 2-way Deterministic Timed Automata (po2DTA) Timed- Unambiguous Interval Logic (T-UIL) po2DTA ≡ T-UIL po2DTA: Small Model for po2DTA: A po2DTA with n states has a “small model” of size atmost n^2 Satisfiability is NP-complete Timed-UIL : Unambiguous chop- wrt the letter and a time constraint 2-NTA –reversal bounded: Satisfiability is in PSPACE Fully decidable timed automata, and logics in real time PROBLEM We have a 2- way DTA, which is reversal bounded due to partial order NTA- complementation undecidable Equivalent logical characterizations Finding a monadic-logic characterization for the same class. We have a boolean-closed timed automaton and logic with NP-complete satisfiability.