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Friday, May 23, 2025

Entry 75

V. Level 5. The McKay-Thompson series of class 5B for the Monster.

j5B(τ)=(η(τ)η(5τ))6

Examples. Surprisingly, the following "cubes" are powers of the golden ratio ϕ=1+52  j5B(1+7/52)=(5)3ϕ3j5B(1+23/52)=(5)3ϕ9j5B(1+47/52)=(5)3ϕ15 These discriminants d=5m have class number h(d)=2.

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