Can epei have the meaning of ‘therefore’, for it seems like that in Crat 414c: ἐπεὶ ἐν τῷ ‘κατόπτρῳ’ οὐ δοκεῖ σοι ἄτοπον εἶναι τὸ ἐμβεβλῆσθαι τὸ ῥῶ? I am not sure I can find this meaning in LS, but Bailly and the Greek- Russian dictionaries have it.
II. of Sequence in thought, i.e. Consequence or Inference, then, therefore, ξεῖνʼ, ἐπεὶ ἂρ δὴ ἔ. .. μενεαίνεις Od.17.185, cf. Il.15.49, 18.357; οὐ σύ γʼ ἔ. Τυδέος ἔκγονός ἐσσι 5.812; rarely at the beginning, ἔπειθʼ ἑλοῦ γε θάτερα S.El.345.
Liddell, H. G., Scott, R., Jones, H. S., & McKenzie, R. (1996). A Greek-English lexicon (p. 615). Oxford: Clarendon Press.
thank you