NEW TRENDS IN APPROXIMATION THEORY: in memory of andre boivin

Content: Preface.- The life and work of Andre Boivin (Gauthier, Manolaki, Mashreghi).- A note on the density of rational functions in AY(W) (Falco, Nestoridis, Zadik).- Approximation by entire functions in the construction of order-isomorphisms and large cross-sections (Burke).- Approximation by solutions of elliptic equations and extension of subharmonic functions (Gauthier, Paramonov).- Approximation in the closed unit ball (Mashreghi, Ransford).- A Thought on Approximation by Bi-Analytic Functions (Khavinson).- Chebyshev polynomials associated with a system of continua (DeFrain).- Constrained L2-approximation by polynomials on subsets of the circle (Baratchart, Leblond, Seyfert).- Extremal bounds of Tichmuller-Wittich-Belinskii type for planar quasiregular mappings (Golberg).- Families of Universal Taylor Series depending on a parameter (Abakumov, Muller, Nestoridis).- Interpolation by bounded analytic functions and related questions (Danielyan).- On two interpolation formulas for complex polynomials (Fournier, Ruscheweyh).- Operators with simple orbital behavior (Prajitura).- Taylor series, universality and potential theory (Gardiner).- Subharmonic images of a convergent sequence (Gauthier, Manolaki).