Abstract
The text of Theaetetus 155b1-2 as recorded in the manuscripts and printed in current editions of the dialogue is marked by a syntactical anomaly (ἀλλά postpositum) and a logical non sequitur (arbitrary transition from a copulative to an existential use of εἷναι and vice versa). Attempts at emendation by Proclus, Stephanus and Campbell have all been unsuccessful. To find the way back to Plato's original text, the reader will have to fight his way through a logical tangle (the result of a double negation) and abandon the modish, but erroneous, belief that there is no difference in ancient Greek between ``complete'' and ``incomplete'' uses of εἷναι.
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