Continuous Rankin bound for Hilbert and Banach spaces
K. Mahesh Krishna · Mathematical Inequalities & Applications · 2025
Let $(Ω, μ)$ be a measure space and $\{τ_α\}_{α\in Ω}$ be a normalized continuous Bessel family for a real Hilbert space $\mathcal{H}$. If the diagonal $Δ:= \{(α, α):α\in Ω\}$ is measurable in the measure space $Ω\times Ω$, then we show that \begin{align} (1) \quad\quad\quad\quad \sup _{α, β\in Ω, α eq β}\langle τ_α, τ_β\rangle \geq \frac{-(μ\timesμ)(Δ)}{(μ\timesμ)((Ω\timesΩ)\setminusΔ)}. \end{align} We call Inequality (1) as continuous Rankin bound. It improves 76 years old result of Rankin [\textit{Ann. of Math., 1947}]. It also answers one of the questions asked by K. M. Krishna in the paper [Continuous Welch bounds with applications, \textit{Commun. Korean Math. Soc., 2023}]. We also derive Banach space version of Inequality (1).