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10 cards from this deck
Sum of first nnn terms of a sequence
Sn=T1+T2+T3+…+TnS_n = T_1 + T_2 + T_3 + \ldots + T_nSn=T1+T2+T3+…+Tn
Partial sum or nnnth partial sum
T1=S1T_1 = S_1T1=S1
Tn=Sn−Sn−1T_n = S_n - S_{n-1}Tn=Sn−Sn−1
Sum (Greek capital sigma)
Starting value (bottom) and ending value (top)
Sequence of partial sums of a sequence
n2−2n+1n^2 - 2n + 1n2−2n+1, not n2−1n^2 - 1n2−1
Ta+Ta+1+Ta+2+…+TbT_a + T_{a+1} + T_{a+2} + \ldots + T_bTa+Ta+1+Ta+2+…+Tb
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