mb event system 2 Sections EventSystems Doc
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Def product-deq(A;B;a;b) == <proddeq(a;b),prod-deq(A;B;a;b)>

is mentioned by

Def KindDeq == union-deq(IdLnkId;Id;product-deq(IdLnk;Id;IdLnkDeq;IdDeq);IdDeq)[Kind-deq]
Def IdLnkDeq == product-deq(Id;Id;IdDeq;product-deq(Id;;IdDeq;NatDeq))[idlnk-deq]
Def IdDeq == product-deq(Atom;;AtomDeq;NatDeq)[id-deq]

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mb event system 2 Sections EventSystems Doc