Commit 68ee814e authored by Robbert Krebbers's avatar Robbert Krebbers
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Weaken the associativity axiom of the Dra class.

Now, associativity needs only to be established in case the elements are
valid and their compositions are defined. This is very much like the notion
of separation algebras I had in my PhD thesis (Def 4.2.1). The Dra to Ra
construction still easily works out.
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