DISOLATE(exp, var1, var2, ..., varN) is similar to ISOLATE(exp, var)  (see
    the MACSYMA  manual p. 89) except that it enables  the user to isolate 
    more than one variable simultaneously.  This  might be useful, for ex-
    ample, if one were attempting to change  variables in a multiple inte-
    gration, and that variable change involved two or more of the integra-
    tion variables.  For example,

                  DISOLATE(A*(B*(C+D) + E*(F+G)), A, B, E);

    returns a form similar to

                               A (B E1 + E E2)         ,

    where E1 is bound to C + D and E2 is bound to F + G.

Author: ASB