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EXPSPACE
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=== Logic === Alur and Henzinger extended [[linear temporal logic]] with times (integer) and prove that the validity problem of their logic is EXPSPACE-complete.<ref>{{Cite journal|last1=Alur|first1=Rajeev|last2=Henzinger|first2=Thomas A.|date=1994-01-01|title=A Really Temporal Logic|journal=J. ACM|volume=41|issue=1|pages=181β203|doi=10.1145/174644.174651|issn=0004-5411|doi-access=free}}</ref> Reasoning in the first-order theory of the real numbers with +, Γ, = is in EXPSPACE and was conjectured to be EXPSPACE-complete in 1986.<ref>{{Cite journal |last=Ben-Or |first=Michael |last2=Kozen |first2=Dexter |last3=Reif |first3=John |date=1986-04-01 |title=The complexity of elementary algebra and geometry |url=https://www.sciencedirect.com/science/article/pii/0022000086900292 |journal=Journal of Computer and System Sciences |volume=32 |issue=2 |pages=251β264 |doi=10.1016/0022-0000(86)90029-2 |issn=0022-0000}}</ref>
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