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.
9. isrcv(kind(e))
9.
9. sends(lnk(kind(e));sender(e))[index(e)]
9. =
9. msg(lnk(kind(e));tag(kind(e));val(e))
10.
e:E. isrcv(kind(e)) sender(e) <c e
11. e : E
12. e' : E
13. e
e,e'. e <loc e' isrcv(kind(e')) & e = sender(e')^+ e'
14. isrcv(kind(e')) & e = sender(e')
first(e') & e <c pred(e') e = pred(e') 
E
isrcv(kind(e')) & e <c sender(e') e = sender(e') E
