منابع مشابه
Birational Geometry Old and New
A classical problem in algebraic geometry is to describe quantities that are invariants under birational equivalence as well as to determine some convenient birational model for each given variety, a minimal model. One such quantity is the ring of objects which transform like a tensor power of a differential of top degree, known as the canonical ring. The histories of the existence of minimal m...
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THE PLAINS The Plains region, an area delineated by the Rocky Mountains on the west; the Canadian provinces of Alberta, Saskatchewan, and Manitoba on the north; the Mississippi River on the east; and the Gulf of Mexico on the south, is home to philosophies, traditions, and ways of life that are some of the most varied and complex in the United States. The Great Plains measure 1,125,000 square m...
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INTRODUCTION Changes in hip structure and geometry during aging contribute to decreased bone strength. Little is known, however, about these characteristics at advanced age, when fragility fractures are common. We examined hip structural geometry in men and women of old age (72-84 years) and old-old age (85-96 years) to determine (1) gender differences; (2) whether or not these differences are ...
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This is a personal account of some of the most exciting challenges computational geometry faces today. Needless to say, my choice of open problems reflects my own taste and bias. I did not wish to cover the whole spectrum of the field and give a bland, comprehensive assessment of what’s ahead for computational geometers. Rather, I chose to discuss a few problems that sprang to my mind as being ...
متن کاملSome Old and New Problems in Combinatorial Geometry
Usually we the number the points Let x l ,x , . . .,xn be n distinct points in a metric space . will restrict ourselves to the plane . Denote by D(x , . . .,x ) of distinct distances determined by x , . . .,x . Assume lthat n are in r-dimensional space . Denote byl n f (n)= min D(x, . . .,x), r xl, . . .,x l n n I conjectured more than 40 years ago that f (n)> c n/(log n) 2 . The lattice points...
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ژورنال
عنوان ژورنال: Časopis pro pěstování matematiky a fysiky
سال: 1881
ISSN: 1802-114X
DOI: 10.21136/cpmf.1881.122769