Def ||as|| == Case of as; nil  0 ; a.as'  ||as'||+1  (recursive)

is mentioned by

Thm* the_w:World, e:E. Thm* FairFifo  isrcv(kind(e))  index(e)  ||sends(lnk(kind(e));sender(e))||	[w-index_wf]
Thm* the_w:World, e:E, t:. Thm* FairFifo Thm*  Thm* isrcv(kind(e)) Thm*  Thm* match(lnk(kind(e));t;time(e)) Thm*  Thm* onlnk(lnk(kind(e));m(source(lnk(kind(e)));t))[(||rcvs(lnk(kind(e));time(e))|| Thm* -||snds(lnk(kind(e));t)||)] Thm* = Thm* msg(a(loc(e);time(e))) Thm*  Msg	[w-match-property]
Thm* the_w:World, e:E. Thm* FairFifo Thm*  Thm* isrcv(kind(e)) Thm*  Thm* (t:time(e).  Thm* (match(lnk(kind(e));t;time(e)) Thm* (& onlnk(lnk(kind(e));m(source(lnk(kind(e)));t))[(||rcvs(lnk(kind(e));time(e))|| Thm* (& -||snds(lnk(kind(e));t)||)] Thm* (& = Thm* (& msg(a(loc(e);time(e))) Thm* (&  Msg)	[better-w-match-exists]
Thm* the_w:World, l:IdLnk, t,t':. Thm* match(l;t;t') Thm*  Thm* ||snds(l;t)||||rcvs(l;t')|| Thm* & ||rcvs(l;t')||<||snds(l;t)||+||onlnk(l;m(source(l);t))||	[assert-w-match]
Thm* w:World, t:, l:IdLnk, i:Id. ||onlnk(l;m(i;t))||	[w-onlnk-m]
Def fpf-is-empty(f) == ||1of(f)||=0	[fpf-is-empty]
Def index(e) Def == ||rcvs(lnk(kind(e));time(e))||-||snds(lnk(kind(e));time(sender(e)))||	[w-index]
Def match(l;t;t') Def == (||snds(l;t)||||rcvs(l;t')||) Def == (||rcvs(l;t')||<||snds(l;t)||+||onlnk(l;m(source(l);t))||)	[w-match]
Def FairFifo Def == (i:Id, t:, l:IdLnk. source(l) = i  onlnk(l;m(i;t)) = nil  Msg List) Def == & (i:Id, t:. Def == & (isnull(a(i;t)) Def == & ( Def == & ((x:Id. s(i;t+1).x = s(i;t).x  vartype(i;x)) Def == & (& m(i;t) = nil  Msg List) Def == & (i:Id, t:, l:IdLnk. Def == & (isrcv(l;a(i;t)) Def == & ( Def == & (destination(l) = i Def == & (& ||queue(l;t)||1 & hd(queue(l;t)) = msg(a(i;t))  Msg) Def == & (l:IdLnk, t:. Def == & (t':.  Def == & (tt' & isrcv(l;a(destination(l);t'))  queue(l;t') = nil  Msg List)	[fair-fifo]
Def queue(l;t) == nth_tl(||rcvs(l;t)||;snds(l;t))	[w-queue]

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