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math.GM2026
Spectral Riccati--Gamma Concavity, Symmetric Zero Cancellation, and Conditional Criteria for the Riemann Hypothesis
Dragos-Patru Covei
We examine a Riccati--Gamma approach to the logarithmic derivative of the completed Riemann zeta function. The first part proves, in full local detail, that a naive two-sided verti…
math.GM2026
Riccati--Gamma Dynamics for Concavity and Asymptotics of Generalized Dirichlet Eta Functions
Dragos-Patru Covei
We develop a unified analytical and dynamical framework for the qualitative study of the one-parameter family of generalized Dirichlet eta functions $η_{a}(t)=\sum_{m\ge0}(-1)^{m}(…
math.GM2023
A nonlinear population model
Dragos-Patru Covei, Traian A. Pirvu, Catalin Sterbeti
This paper considers a nonlinear model for population dynamics with age structure. The fertility rate with respect to age is non constant and has the form proposed by [17]. Moreove…