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 -- GPG: 4096R/1318EFAC5FBBDBCE git://github.com/infinity0/pubkeys.git
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