// *(+(x,y,...);c) -> +(*(x,c),*(y,c),...) (c numeric(), no powers of +())
add const & addref=ex_to_add((*seq.begin()).rest);
epvector distrseq;
// *(+(x,y,...);c) -> +(*(x,c),*(y,c),...) (c numeric(), no powers of +())
add const & addref=ex_to_add((*seq.begin()).rest);
epvector distrseq;