Multisets multisets on S={1,2,...,n} (1+x1+c+…)(1+x2+c2+…)…(1+xm+x2+…) =Πxma) m:S→Nxi∈S 1+++…”=∑m+m=()》* |‖geometric m∈Nn (1-x）n=∑-m(-n-1）(-n-k+1(-1)xk k! k≥0 TaylorMultisets 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