Graph of f(x, y) = cos 2x· cos 3y A pair of periods (ω1, ω2) for a function f is a fundamental pair if all the periods of f can be written in the formmω1 +nω2 for m, n∈Z. We can create a parallelogram by considering 0, ω1, ω2, and ω1 +ω2. Figure 1.2.a from [1] This parallelogram is important because it is part of a larger lattice. Page 36 Riley • An Overview of Monstrous Moonshine
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