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I argue that opposite arrows of time, while being logically possible, cannot realistically be assumed to exist during one and the same epoch of this universe.
In a series of papers [1, 2, 3], Lawrence Schulman presented examples which demonstrate the compatibility of opposite arrows of time in various situations. In a previous letter to this journal  I questioned some of them for not being realistic in spite of being logically correct. Schulman replied  to these objections in a letter directly succeeding my… (More)