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In This Issue
Editorial Messages
Conference Announcements

OBITUARIES
Richard J. Gardner
Washek Pfeffer, November 14, 1936 – January 3, 2021

Thierry De Pauw
Comments on Washek Pfeffer's Contributions to Integration Theory

Laurent Moonens
Washek Pfeffer's Books on Riemann-Type Integration

Gary Gruenhage
Some Remarks on Washek Pfeffer's Contributions in General Topology

Paul D. Humke
Togo Nishiura, November 10, 1931 – February 12, 2021

RESEARCH ARTICLES
Tomasz Filipczak and Grażyna Horbaczewska
Exceptional Points for Densities Generated by Sequences

Harrison Gaebler
Towards a Characterization of the Property of Lebesgue

Maxim J. Goldberg and Seonja Kim
An Explicit Characterization of the Domain of the Infinitesimal Generator of a Symmetric Diffusion Semigroup on LP of a Complete Positive Sigma-Finite Measure Space

Horst Alzer
Inequalities for Weighted Arithmetic and Geometric Means

Miroslav Repický
Spaces Not Distinguishing Ideal Convergences of Real-Valued Functions, I

Miroslav Repický
Spaces Not Distinguishing Ideal Convergences of Real-Valued Functions, II

Nicholas P. M. Kayban and Xianfu Wang
On Functions Determined by Dense Sets

David Hruška
A Note on Directional Lipschitz Continuity in the Euclidean Plane

Mrinal Kanti Roychowdhury
Optimal Quantization for Mixed Distributions

David de Hevia Rodríguez
On Real Universality in the Birkhoff Sense

INROADS
Marek Bienias and Szymon Głab
Lebesgue Density and Statistical Convergence

Rodolfo E. Maza and Sergio R. Canoy Jr.
On the SL-Integral of LCTVS-Valued Functions

Haipeng Chen and Jonathan M. Fraser
On Hölder Maps and Prime Gaps