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GENITIVE OF CONNECTION
The genitive may express a more or less close connection or relation, where περί is sometimes added.
With verbs of saying or thinking: τί δὲ ἵππων οἴει; but what do you think of horses? R. 459b. Often in poetry: εἰπὲ δέ μοι πατρός
but tell me about my father λ 174, τοῦ κασιγνήτου τί φῄς; what dost thou say of thy brother? El. 317.
The genitive is often used loosely, especially at the beginning of a construction, to state the subject of a remark: ἵππος ἢν κακουργῇ, τὸν ἱππέᾱ κακίζομεν· τῆς δὲ γυναικός, εἰ κακοποιεῖ κτλ. if a horse is vicious, we lay the fault to the groom; but as regards a wife, if she conducts herself ill, etc. O. 3.11, ὡσαύτως δὲ καὶ τῶν ἄλλων τεχνῶν
and so in the case of the other arts too Charm. 165d, τί δὲ τῶν πολλῶν καλῶν; what about the many beautiful things? Ph. 78d.
In the index: Connection · Genitive case