C PROVEC    SOURCE    CHAT      05/01/13    02:35:14     5004
      SUBROUTINE PROVEC(A,B,C)
      IMPLICIT INTEGER(I-N)
      IMPLICIT REAL*8 (A-H,O-Z)
      DIMENSION A(3),B(3),C(3)
      C(1)=A(2)*B(3)-B(2)*A(3)
      C(2)=A(3)*B(1)-A(1)*B(3)
      C(3)=A(1)*B(2)-A(2)*B(1)
      RETURN
      END