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Genitive: source as modifier
οὐ γὰρ τοῦτ’ ἦν εὐδαιμονία, ὡς ἔοικε, κακοῦ ἀπαλλαγή
‘’ (Plat. Gorg. 478c)
The genitive signals a source as a modifier.
This genitive is used with a noun of motion or separation (to remove, to rob, to differ, to yield, to descend from etc.), especially compounds with ἐκ- and ἀπο-. This genitive has a strong affinity with objects in the genitive.
μήτε ὁμοίαν κατὰ πάντα τὴν θεωρίαν ἔχειν ἢ τοῖς περὶ βίων λόγοις ἢ τοῖς κατὰ τὴν τῶν ἄλλων φυσικῶν προβλημάτων κάθαρσιν
[One should] not [want] to have a single theory for everything: either [the theory] in my work about the art of living or [the theory] in my work about the solution to the other natural problems.