منابع مشابه
In memoriam Ernst Mayr
Ernst Mayr, Professor Emeritus of the Harvard University Museum of Comparative Zoology, who died on 3 February 2005 in Bedford, Massachusetts, at the age of 100+, was one of the major evolutionary scholars of our time. Mayr’s life was devoted to understanding the biodiversity of life and its dramatic adaptive evolution. His impact on evolutionary biology was profound and long lasting. He is wid...
متن کاملIn Memoriam Ernst Steinitz ( 1871 - 1928 )
One of the first eager readers of Steinitz’s paper was Emmy Noether. At the time when the paper appeared she was still living in her hometown Erlangen, during what may be called the period of her apprenticeship, studying the highlights of contemporary mathematics of the time. Her guide and mentor in this period was Ernst Fischer. We can almost be sure that Steinitz’s paper was the object of ext...
متن کاملMore on rc-Lindelöf sets and almost rc-Lindelöf sets
A subset A of a space X is called regular open if A = IntA, and regular closed if X\A is regular open, or equivalently, if A= IntA. A is called semiopen [16] (resp., preopen [17], semi-preopen [3], b-open [4]) ifA⊂ IntA (resp.,A⊂ IntA,A⊂ IntA ,A⊂ IntA∪ IntA). The concept of a preopen set was introduced in [6] where the term locally dense was used and the concept of a semi-preopen set was introd...
متن کاملOn Productively Lindelöf Spaces
We study conditions on a topological space that guarantee that its product with every Lindelöf space is Lindelöf. The main tool is a condition discovered by K. Alster and we call spaces satisfying his condition Alster spaces. We also study some variations on scattered spaces that are relevant for this question.
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ژورنال
عنوان ژورنال: Acta Mathematica
سال: 1947
ISSN: 0001-5962
DOI: 10.1007/bf02404690