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Quick and uniform emergence is one of the factors determining height and stability of the yield of cereals, especially of their spring forms. Thus, it is relevant to learn about the effect of fractionation of the seed material of spring wheat and spring rye. Over the years 2004-2009 two series of microplot experiments were conducted, whose aim was to determine and compare the effect of seed grain...
We present a general method of designing fast approximation algorithms for cut-based minimization problems in undirected graphs. In particular, we develop a technique that given any such problem that can be approximated quickly on trees, allows approximating it almost as quickly on general graphs while only losing a poly-logarithmic factor in the approximation guarantee. To illustrate the applicability...
In this paper, we set forth a new algorithm for generating approximately uniformly random spanning trees in undirected graphs. We show how to sample from a distribution that is within a multiplicative (1+ ??) of uniform in expected time O??(m??n log 1/??). This improves the sparse graph case of the best previously known worst-case bound of O(min {mn, n2.376}), which has stood for twenty years. To...
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