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A new construction is presented of scalar-flat Kähler metrics on non-minimal ruled surfaces. The method is based on the resolution of singularities of orbifold ruled surfaces which are closely related to rank-2 parabolically stable holo-morphic bundles. This rather general construction is shown also to give new examples of low genus: in particular, it is(More)
As of now, it is an open problem to find an algorithm that computes the Galois group G of an arbitrary linear ordinary differential operator L ∈ C(x)[D]. We assume that C is a computable, characteristic-zero, algebraically closed constant field with factorization algorithm. In this dissertation, we present new methods for computing differential Galois(More)
Internship—3-36 hours. Prerequisite: lower division standing and consent of instructor. Work experience off and on campus in soil science. Internship supervised by a member of the faculty. Biological Sciences 1C recommended. Soil as part of natural and managed ecosystems and landscapes. Solid, liquid, and gas phases and their interactions in the soil.(More)
Defensive traits exhibited by plants vary widely across populations. Heritable phenotypic differentiation is likely to be produced by genetic drift and spatially restricted gene flow between populations. However, spatially variable selection exerted by herbivores may also give rise to differences among populations. To explore to what extent these factors(More)
Michael Singer joined Sulzer Pumps (US) Inc. in 2005. He received a BSME degree from Portland State University and holds a professional engineering license from the state of Oregon. He is currently responsible for performing and defining methods of finite-element analyses while based in Winterthur, Switzerland. Torsten Johne has 16 years of practical(More)
A complex ruled surface admits an iterated blow-up encoded by a parabolic structure with rational weights. Under a condition of parabolic stability, one can construct a Kähler metric of constant scalar curvature on the blow-up according to [18]. We present a generalization of this construction to the case of parabolically polystable ruled surfaces. Thus we(More)