Note 440 — Chapter IV · PARMENIDES OF ELEA
Reading edition
Diels formerly read ἔκ πη ἐόντος, “from that which in any way is”; but he has now reverted to the reading ἔκ μὴ ἐόντος, supposing that the other horn of the dilemma has dropped out. In any case, “nothing but what is not can arise from what is not” gives a perfectly good sense.