Oidipous has been measuring the time of Kreon’s absence against a mental schedule, which implies that he has knowledge of the distance to Delphi, rate of travel there and back, and time required to arrange a consultation with the Oracle. Perhaps this information would have been common knowledge all over the Greek world. The audience is aware, however, that Oidipous has personal knowledge deriving from his own journey years before that brought him from Delphi to Thebes along a path on which he killed a man and at the end of which the Sphinx awaited him. Surely, as he travels mentally he should recall those incidents and realize that he killed a man whose identity he did not know. [Mei]