نتایج جستجو برای: flat strong cover

تعداد نتایج: 532228  

2011
Michael Lehning Thomas Grünewald

A local to regional assessment of transported snow during snow storms or subsequent periods of strong winds is a prerequisite to reliably predict avalanche danger. Despite the fact that it has received continuing attention for decades, the problem of quantifying snow transport persists. Systems from point measurements to full three-dimensional simulations are in operation but all have their res...

Journal: :JoCG 2013
Oswin Aichholzer Greg Aloupis Erik D. Demaine Martin L. Demaine Sándor P. Fekete Michael Hoffmann Anna Lubiw Jack Snoeyink Andrew Winslow

Can folding a piece of paper flat make it larger? We explore whether a shape S must be scaled to cover a flat-folded copy of itself. We consider both single folds and arbitrary folds (continuous piecewise isometries S → R2). The underlying problem is motivated by computational origami, and is related to other covering and fixturing problems, such as Lebesgue’s universal cover problem and force ...

2009
Edgar E. Enochs Zhaoyong Huang

In terms of the duality property of injective preenvelopes and flat precovers, we get an equivalent characterization of left Noetherian rings. For a left and right Noetherian ring R, we prove that the flat dimension of the injective envelope of any (Gorenstein) flat left R-module is at most the flat dimension of the injective envelope of RR. Then we get that the injective envelope of RR is (Gor...

Journal: :Linear Algebra and its Applications 2017

2010
Wes Toller Adolphe O. Debrot Mark J. A. Vermeij Paul C. Hoetjes

Saba Bank is a 2,200 km(2) submerged carbonate platform in the northeastern Caribbean Sea off Saba Island, Netherlands Antilles. The presence of reef-like geomorphic features and significant shelf edge coral development on Saba Bank have led to the conclusion that it is an actively growing, though wholly submerged, coral reef atoll. However, little information exists on the composition of benth...

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