2. FairFifo
3.
e,e':E. loc(e) = loc(e') 
e <c e' 
e = e' e' <c e
4.
e:E. first(e) 
(e':E. loc(e') = loc(e) 
e' <c e)
5.
e:E.
5.
first(e)
5.
5. loc(pred(e)) = loc(e) & pred(e) <c e
5. & (
e':E. loc(e') = loc(e) (pred(e) <c e' & e' <c e))
6.
e:E. first(e) (x:Id. (x when e) = (x after pred(e)))
7. Trans e,e':E. e <c e'
8. SWellFounded(e <c e')
9. e : E
10. isrcv(kind(e))
11. n :
time(e)
12. match(lnk(kind(e));n;time(e))
13. t :
14. mu(
t.match(lnk(kind(e));t;time(e))) = t
time(<source(lnk(kind(e))),t>) ~ t
