Subjunctive: Hortative
The subjunctive is used as a first person imperative with the meanings of invitation and autoprescription, which is just what we expect from Xrakovskij's cross-linguistic study. These uses could have developed from the future meaning of the subjunctive in combination with the first person. However, some of the examples of this construction are not performative, but rather express the intent of the speaker. This is a true deontic meaning: a third category in addition to the two categories (epistemic and performative) distinguished in the grammar books.
Subjunctive: Negative Directive
Grammar books claim that the subjunctive is used as the perfective equivalent of present imperative in the negative directive construction. But previous explanations for why the aorist imperative was not used instead are not sufficient, and it is therefore interesting to see that in other languages, two different types of negative directive expression are grammaticalised: preventive and prohibitive, as described in Xrakovskij's study. The Homeric examples could be explained in the same way.
I 2.236 οἴκαδέ περ σὺν νηυσὶ νεώμεθα, τόνδε ἐῶμεν let's sail off for home
O 22.139 ἀλλ' ἄγεθ', ὑμῖν τεύχε' ἐνείκω θωρηχθῆναιἐκ θαλάμου· But come, let me bring you weapons from the store-room to arm yourself with,
O 2.222 εἰ δέ κε τεθνηῶτος ἀκούσω μηδ' ἔτ' ἐόντος,
νοστήσας δὴ ἔπειτα φίλην ἐς πατρίδα γαῖαν
σῆμά τέ οἱ χεύω καὶ ἐπὶ κτέρεα κτερεΐξω
πολλὰ μάλ', ὅσσα ἔοικε, καὶ ἀνέρι μητέρα δώσω.
If I hear he’s dead, no longer alive, I’ll go back to my beloved home, raise a grave-mound for him, and add to his burial honours as much as he deserves, and give my mother to another.

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