4 *CMZ :- -26/04/91 11.11.56 by Bryan Webber
6 *-- Author : Bryan Webber
8 C----------------------------------------------------------------------
12 C----------------------------------------------------------------------
14 C LORENTZ 4-VECTOR DOT PRODUCT
16 C----------------------------------------------------------------------
18 DOUBLE PRECISION HWULDO,P(4),Q(4)
20 HWULDO=P(4)*Q(4)-(P(1)*Q(1)+P(2)*Q(2)+P(3)*Q(3))