Imperative vs Jussive vs Hortative

As far as I can tell, the imperative, jussive and hortative cases have
roughly the same semantic connotation, except they're split by person,
thus:

Hortative: 1st person plural inclusive (Let's eat!)
Imperative: 2nd person (Go!)
Jussive: 3rd person (Let them eat cake!)

Is that all there is to it, or am I missing some subtle (or not so subtle)
distinction? I notice the jussive and hortative are formed with "let" in
English, but is that part of a larger pattern, for instance?




Paul

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