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math.GM2026
A Ramanujan Pell Elliptic K3 Surface and Primitive Five-Cube Near Misses
K. Srinivasa Raghava
We construct a trace-16 Ramanujan--Pell family of primitive positive five-cube near misses \[ a_n^3+b_n^3+c_n^3+d_n^3+e_n^3=t_n^3+(-1)^{n+1}, \] obtained from a six-cube identity o…
math.GM2026
Boolean Walsh Eta Units and Eisenstein Bases For Squarefree Levels
K. Srinivasa Raghava
Let be squarefree and let be its Boolean divisor cube. To each Boolean character we attach the eta-quotient \[ R_T^{(M)}(τ)=\prod_{d\mid M}η(dτ)^{χ_T(d)}, \qquad…