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  • #42
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Issue created Nov 14, 2016 by Ralf Jung@jungOwner

Authoritative with fraction

The authoritative CMRA provides a CMRA with a single, authoritative state. Several times now (most recently when @janno asked me about sth. like this today), it seemed useful to allow more than one authoritative state, that all have to be brought together to change it. I just realized that this could be supported by a fairly small change in the authoritative CMRA, namely to replace Ex(M) by Frac * Ag(M):

 Auth(M) := { (x, a) \in (Frac * Ag(M))^? * M | ...}

The interface would then change to allow a fraction in the ● notation (and once we have an infrastructure for "assertions that can be split at a fraction", it could be registered there). What do you think?

Cc @janno @robbertkrebbers @jjourdan

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