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Feb 12, 2016 at 15:23 history edited Fedor Petrov CC BY-SA 3.0
deleted 51 characters in body
Feb 12, 2016 at 11:02 comment added Fedor Petrov open ray is $(-\infty,a)$ or $(a,+\infty)$. Yes, preimage may be also empty or the whole line.
Feb 12, 2016 at 10:37 vote accept Matija Sreckovic
Feb 12, 2016 at 10:37 comment added Matija Sreckovic Not sure about the formal definition of a ray, but the preimage of $v$ could also be the whole real line. Anyway, brilliant solution!
Feb 12, 2016 at 10:29 history edited Fedor Petrov CC BY-SA 3.0
added 14 characters in body
Feb 12, 2016 at 10:05 history answered Fedor Petrov CC BY-SA 3.0