ex evalm() const { return bp->evalm(); }
ex eval_ncmul(const exvector & v) const { return bp->eval_ncmul(v); }
ex eval_integ() const { return bp->eval_integ(); }
ex evalm() const { return bp->evalm(); }
ex eval_ncmul(const exvector & v) const { return bp->eval_ncmul(v); }
ex eval_integ() const { return bp->eval_integ(); }