u • t. t= , NI • et 00.26•13=rina=0•00- Lry bininirrtint en ill k. MIS ea Pit Wili tis ION it tt• Mt Um ado tallitite Oa of „ II 1000 01 Zit= Ig ia • • 0 10 10. MI ObIlml oats 0 tom triglookli ihs =L e :root POW Pt a seg s1 at • Mt tW I VIM CZ ilrtkAm osy :::lAR IB at, vert iettir

j,(r) meet zacts. The phase space is initially six dimensional. Let us start with the case where three wordlines intersect at a single point, p° =Zit= 4 3 = 273. (96) The condition that all three intersection points are equal is four equations. So the set of histories in which this is the case is

. y, c W Y Pt W4 •A 1 ••••••••• , ,, ,, ...., k• k ;r4 ;••••;:tka boi ....In, t• •nt , ••••••1.) - Ca ken ' MORI! -- ,, 4111 Zit= 10711).POPIIIAIII% =MI ▪ ;"RCTAni eBn/ AITIOSTAIIS )i .utrpyrARS bal•), ,, IDST•ni •ntOSr•R , W4, 1, 10.510/I POW VATS0 •T wt.t.irm.• .14