mb event system 3 Sections EventSystems Doc
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Def Action(i) == action(w-action-dec(w.TA;w.M;i))

is mentioned by

Thm* the_w:World, e:E. act(e {a:Action(loc(e))| isnull(a) }[w-act_wf]
Thm* the_w:World, i:Id, a:Action(i), l:IdLnk. isrcv(l;a msg(a Msg[w-msg_wf]
Thm* the_w:World, i:Id, t:. a(i;t Action(i)[w-a_wf]
Thm* the_w:World, l:IdLnk, i:Id, a:Action(i).
Thm* isrcv(l;a isnull(a) & isrcv(kind(a)) & lnk(kind(a)) = l
[assert-w-isrcvl]
Thm* the_w:World, l:IdLnk, i:Id, a:Action(i). isrcv(l;a [w-isrcvl_wf]
Thm* the_w:World, i:Id, a:Action(i). isnull(a val(a valtype(i;a)[w-val_wf]
Thm* the_w:World, i:Id, a:Action(i). isnull(a valtype(i;a Type[w-valtype_wf]
Thm* the_w:World, i:Id, a:Action(i). isnull(a kind(a Knd[w-kind_wf]
Thm* the_w:World, i:Id, a:Action(i). isnull(a [w-isnull_wf]

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mb event system 3 Sections EventSystems Doc