A Few Words about V. A. Zalgaller

A short version of a lecture given at the conference in the Weizmann Institute (Rehovot, Israel) devoted to V. A. Zalgaller's 80th birthday.     

Dedicated to Professor Paul L. Butzer for his 70th birthday.

Dedication

Dedicated to Professor Paul L. Butzer for his 70th birthday.     

The vile,dopey, evil and odious game players

Many of my friends celebrate anniversaries these days, be it 50th birthday, or 60th, 70th, 80th, even 90th. It is to be deplored that they all accumulate together, rather than distribute themselves uniformly over my lifetime! It is now Gert Sabidussi’s turn, who just joined the octogenarians club, and it is a pleasure to dedicate a paper to him, since he did, and continues to do, excellent algebraic graph theory, including insights into the automorphism group of graphs, studies of stable graphs, Sabidussi representation theorems for symmetric graphs, Sabidussi’s compatibility conjecture, Sabidussi graphs, etc. Many leading mathematicians throughout the world are working on problems and insights initiated by Gert. He does all this in a relaxed playful way, as I witnessed when I acquired my own Sabidussi number 1. Hence it is only natural to relate here the fun that Gert and his friend Wil had while playing games in Dubrovnik, where a grand conference took place in 2009 honoring Gert. Unfortunately, I had to skip that conference, but, unknown to them, I planted a listening device.     

Nikolai Nikolaevich Krasovskii (on the 90th anniversary of his birth)

The paper presents the opening address delivered by D.V. Anosov at the conference “Optimal Control and Applications” dedicated to the 105th birthday of Lev Semenovich Pontryagin (Moscow, Steklov Mathematical Institute of Russian Academy of Sciences, September 24–25, 2013).     

Functional connectedness and Darboux property of multivalued functions

To 80^th birthday of Paul Erds     

A description of the segment [1,T], where T is the meeting number of a set-lattice

To 80^th birthday of Paul Erds     

Judicious partitions of graphs

To 80^th birthday of Paul Erds     

Report on the open problems session

This report summarizes the problems presented during the last session of the “Algebra meets Topology: Advances and Applications” conference in honor of Dikran Dikranjan on his 60th birthday, Barcelona, July 20–23, 2010.     

Preface: Special issue in honor of Claude-Michel Brauner

This special issue of the Journal of Applied Analysis and Computation is dedicated to Claude-Michel Brauner on the occasion of his 70th birthday. Claude-Michel Brauner is Emeritus Professor at the university of Bordeaux (IMB) and was Professor at the School of Mathematical Sciences of Xiamen University for eight years. Furthermore, he is corresponding member of the SMAI (french SIAM) for China and has played a significant role in Sino-French cooperation in applied mathematics. In June 9-12, 2017 the Sino-French Conference on Modeling, Mathematical Analysis and Computation was held in Xiamen University to celebrate his 70th birthday. This volume gathers carefully selected contributions from invited speakers and participants of the conference; it reflects the large variety of the themes addressed during this event.     

Spectral properties of operators for the systems of hydrodynamics of a rotating liquid and nonuniqueness of the limit amplitude

Dedicated to the 80th birthday of Sergei L'vovich Sobolev.     

Gromov-Witten invariants and quantum cohomology

This article is an elaboration of a talk given at an international conference on Operator Theory, Quantum Probability, and Noncommutative Geometry held during December 20–23, 2004, at the Indian Statistical Institute, Kolkata. The lecture was meant for a general audience, and also prospective research students, the idea of the quantum cohomology based on the Gromov-Witten invariants. Of course there are many important aspects that are not discussed here. Dedicated to Professor K B Sinha on the occasion of his 60th birthday     

Centralizer near-rings determined by PID-modules,II

We answer an open problem in radical theory by showing that there exists a zero-symmetric simple near-ringN with identity such thatJ ₂(N)=N.To 80^th birthday of Paul Erds     

Order-continuous extension of a positive operator

For S. L. Sobolev's 80th birthday.     

Eigenoscillations of a string with an additional mass

Dedicated to S. L. Sobolev on the occasion of his 80th birthday.     

Dissipative effect for second-order parabolic operators

Dedicated to Sergei L'vovich Sobolev on his 80th birthday.     

Never lie against truth

This is a short tribute to Aleksandr A. Borovkov on the occasion of his 80th birthday.     

A Life's Work in Geometry: An Homage to Hanfried Lenz

We give a brief review of the mathematical work of HanfriedLenz, at the occasion of his 80th birthday on April 22, 1996.     

A partial plane of order 6 constructed from the icosahedron

We show that a maximal partial plane of order 6 with 31 lines and a maximal pure partial plane of order 6 with 25 lines can be constructed from the icosahedron and the Petersen graph. To Daniel R. Hughes, to commemorate his 80th birthday, August 7th, 2007.     

The mathematization of the individual sciences — Revisited

We recall major findings of a systematic investigation of the mathematization of the individual sciences, conducted by the author in Bielefeld some 35 years ago under the direction of Klaus Krickeberg, and confront them with recent developments in physics, medicine, economics, and spectral geometry. Dedicated to the 80th birthday of Klaus Krickeberg     

The role of the Crank-Gupta model in the theory of free and moving boundary problems

A very brief review is given of the striking way in which the Crank-Gupta model has enhanced our understanding of the well-posedness of free and moving boundary problems.Dedicated to Professor J. Crank on the occasion of his 80th birthday