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Shouldn't this be less than equal to (<=) because we are talking about previous operator? So, for t1: 0<= t1 <= t0 and for t0 : t0>0
Exam paper: question 9)(d)
https://es.cs.uni-kl.de/teaching/vrs/exams/2017.08.29.vrs/2017.08.29.vrs.solutions.pdf