It is known that the M-branes of M-theory correspond to p-form charges
in the D = 11 spacetime supersymmetry algebra. Here we show that thei
r intersections are encoded in the p-form charges of their worldvolume
supersymmetry algebras. Triple intersections are encoded in double in
tersection worldvolume algebras with eight supercharges. (C) 1998 Else
vier Science B.V.