Multisets multisets on S={1,22,...,n} (1+x1+x子+…)(1+c2+2+…)…(1+xn+x2+…) =∑Ⅱe m:S→Nxi∈S (1+x+x2+…)n=∑xm1++mm=】 (0) ll geometric m∈Nm (1-x）n=∑（-m-n-1)（-n-k+1(-1)'k k≥0 k! Taylor Multisets multisets on (1 + x1 + x2 1 + ···)(1 + x2 + x2 2 + ···)···(1 + xn + x2 n + ···) S = {x1, x2,...,xn} = ￾ m:S￾N ⇥ xi⇥S x m(xi) i (1 + x + x2 + ···) n = ⇤ k￾0 ￾￾n k ⇥⇥ xk = ￾ m⇥Nn xm1+···+mn (1 ￾ x) ￾n = ￾ k￾0 (￾n)(￾n ￾ 1)···(￾n ￾ k + 1)(￾1)k k! xk = geometric Taylor