What is the remainder term RkR_kRk for a convergent series where S=Sk+RkS = S_k + R_kS=Sk+Rk?
Rk=∑n=k+1∞anR_k = \sum_{n=k+1}^{\infty} a_nRk=∑n=k+1∞an
Rk=∑n=1kanR_k = \sum_{n=1}^{k} a_nRk=∑n=1kan
Rk=limn→∞anR_k = \lim_{n \to \infty} a_nRk=limn→∞an
Rk=S−akR_k = S - a_kRk=S−ak