Summations
? f(ak) denotes the sum f(a1) + f(a2) + … + f(an).
12 + 22 + 32 + 42 = 1+4+9+16 = 30
? ? (k*k*i) = ? (k*k*1 + k*k*2) =
(1*1*1 + 1*1*2) + (2*2*1 + 2*2*2) + (3*3*1 + 3*3*2) = 42
? f(a) denotes the sum of the values of f(a), for all members a of
? 2*a = 2*0 + 2*3 + 2*5 = 0 + 6 + 10 = 16