Tribute to Neil Hindman: Mathematician and Humanitarian

Idempotents in βS that are only products trivially Neil Hindman and

All results mentioned in this abstract assume Martin’s Axiom. (Some of them are known to not be derivable in ZFC.) It is known that if S is the free semigroup on countably many generators, then there exists an idempotent p ∈ βS such that if q, r ∈ βS and qr = p, then q = r = p. We show that the same conclusion holds for the semigroups (N, ·) and (F ,∪) where F is the set of finite nonempty subs...

To an unknown mathematician!

It is said in the New Testament that the apostle Paul, when addressing the Athenians, complimented them for having inscribed “To an unknown god” onto one of their altars. Reading the Babylonian tablet YBC 7289 (Yale Babylonian Collection), one might well be tempted to erect another altar to this unknown mathematician who, nearly four thousand years ago, engraved into clay what is for us one of ...

Membrane Science and Research: A Tribute to Professor Takeshi Matsuura

Tribute To

tal of Moldova, the Eastern province of Romania, into the family of a philosophy professor and a teacher. He was educated at the ‘B.P. Hasdeu’ College of Buzau, in Romania, where in 1930 he earned his bachelor’s degree, followed by graduating the School of Medicine of the University of Bucharest, Romania. His MD thesis had a rather unusual topic: the reconstitution of the nephron of the marine ...

Tribute to

P Biman Bagchi has made pivotal contributions to the area of dynamics of chemical and biological systems in an academic career spanning more than three decades. He has been a great teacher and mentor for a large number of young theoretical physical chemists of India and a creative and insightful collaborator with leading scientists worldwide. We take great pride in guest editing this special is...