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when toggle format what by license comment
Aug 14, 2014 at 8:31 comment added coppro Yeah, my bad. I wrote it down wrong, serves me right. Meant to ask about the prefix-closed regular languages, where there isn't such a trivial counterexample.
Aug 13, 2014 at 7:32 history answered Bjørn Kjos-Hanssen CC BY-SA 3.0