Janne Heittokangas

collaborators

3 papers

math.CA2024

Convergence of sub-series' and sub-signed series' in terms of the asymptotic $ψ$ -density

Janne Heittokangas, Zinelaabidine Latreuch

Given a non-negative real sequence ${c_{n}}_{n}$ such that the series $\sum_{n = 1}^{\infty} c_{n}$ diverges, it is known that the size of an infinite subset $A \subset N$ can be m…

math.CA2024

Asymptotic $ψ$ -densities of subsets of natural numbers

Janne Heittokangas, Zinelaabidine Latreuch

The sizes of subsets of the natural numbers are typically quantified in terms of asymptotic (linear) and logarithmic densities. These concepts have been generalized to weighted $w$ …

math.CV2023

Standard solutions of complex differential equations

Janne Heittokangas, Samu Pulkkinen, Hui Yu +1

A meromorphic solution of a complex linear differential equation (with meromorphic coefficients) for which the value zero is the only possible finite deficient/deviated value is ca…

Convergence of sub-series' and sub-signed series' in terms of the asymptotic ψ-density

Asymptotic ψ-densities of subsets of natural numbers

Standard solutions of complex differential equations

Convergence of sub-series' and sub-signed series' in terms of the asymptotic $ψ$ -density

Asymptotic $ψ$ -densities of subsets of natural numbers