P(n) = 1^2 + 2^2 + ... + n^2
P(1) = 1
P(2) = 1 + 4 = 5;
P(3) = 5 + 9 = 14;
P(4) = 14 + 16 = 30;
Determine whether a vector is monotonically increasing
Energy of a photon
Divide by 4
Matrix of almost all zeros, except for main diagonal
Generate this matrix
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