Guillera–Almkvist conjecture on rationality and algebraicity in Ramanujan-like series

From papers

Let q=qeiπrq=|q|e^{i\pi r}, and use α0=α(q0)\alpha_0=\alpha(q_0), α1=α(q1)\alpha_1=\alpha(q_1), τ0=τ(q0)\tau_0=\tau(q_0), and analogous notation for the other quantities. Suppose

n=0z(q)n[i=04(si)n(1)n](a(q)+b(q)n+c(q)n2)=1π2.\sum_{n=0}^{\infty} z(q)^n \left[ \prod_{i=0}^4 \frac{(s_i)_n}{(1)_n} \right] (a(q)+b(q)n+c(q)n^2)=\frac{1}{\pi^2}.

Guillera–Almkvist conjecture. The quantities rr, α0\alpha_0, and τ02\tau_0^2 are rational if and only if z0z_0, c0c_0, b0b_0, and a0a_0 are algebraic.

This conjecture was first stated for hypergeometric series and later extended to all cases considered here. The supplied text gives no resolution status.

Progress summary

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Sources & referencesView supporting material

Primary source

Jesús Guillera, “Kind of proofs of Ramanujan-like series”, arXiv:1203.1255 (2012).

Solutions 0

No solutions have been posted yet.