mb event system 3 Sections EventSystems Doc
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Def false == inr()

is mentioned by

Def first(e)
Def == if time(e)=0 true
Def == i; isnull(a(loc(e);time(e)-1)) first(<loc(e),time(e)-1>)
Def == else false fi
Def (recursive)
[w-first]
Def es-ble{i:l}(es;e;e')
Def == InjCase(decidable__es_DASH_le{1:l, i:l}(es,e',e); x. true, false)
[es-ble]

In prior sections: bool 1 sqequal 1 list 1 union mb basic mb event system 2

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mb event system 3 Sections EventSystems Doc