[messaging] Message order in group chat (attempt at summary)

[Ximin Luo]

On 30/04/14 23:58, Ximin Luo wrote:
> - for any given user, if they refer to parents P in one event E, their future event E' >= E must refer to parents P' all of whose elements are >= all elements of P. Or equivalently, ancestors(E) is a subset of ancestors(E').

Scratch that, the "or equivalently" part is false. I'm not sure if there's a simpler way of stating this formally, but in natural language, this is the property that, if I claim my last-messages-seen was P, I can't later claim that my last-messages-seen was anything before P.

X

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