Hùng Việt Chu

collaborators

3 papers

math.CO2026

Schreier Sets of Intervals, Super-Schreier Sets, and Catalan Numbers

Hung Viet Chu, Mariam Khaduri, Moiz M. Khokhar +1

A finite nonempty set $F \subset N$ is Schreier if $min F \geq ∣ F ∣$ . First, we prove a linear recurrence relation and compute initial counts for Schreier sets consisting of i…

math.CO2026

Linear Recurrences of Generalized Schreier Sets Revisited

Hung Viet Chu, Zachary Louis Vasseur

For $p, q \in N$ , a finite nonempty set $F$ is said to be $(p, q)$ -Schreier (or maximal $(p, q)$ -Schreier, respectively) if $q min F \geq p ∣ F ∣$ (or $q min F = p ∣ F ∣$ , respective…

math.FA2025

Lower-Order Refinements of Greedy Approximation

Kevin Beanland, Hung Viet Chu, Thomas Schlumprecht +1

For two countable ordinals $I^\pm$ and $I^^{2}$ , a basis of a Banach space $X$ is said to be $(I^\pm, I^^{2})$ -quasi-greedy if it is 1) quasi-greedy, 2) $S_{I^} \pm$ -unconditional but not $\…