Reinhard Steffens

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Let g1, . . . , gk be tropical polynomials in n variables with Newton polytopes P1, . . . , Pk. We study combinatorial questions on the intersection of the tropical hypersurfaces defined by g1, . . . , gk, such as the f -vector, the number of unbounded faces and (in case of a curve) the genus. Our point of departure is Vigeland’s work [33] who considered(More)
oxidase in membranes from hydrogenase-induced cells was reduced by H a, N A D P H and N A D H . Rotenone depressed initial rates of N A D P H and NADH-suppor ted cytochrome aa 3 reduction by 56 and 54%, respectively [6], while it had no effect on the reaction with H 2 (Fig. 1 B). This indicates that the oxidation of H2 is not mediated by NAD(P) § [6]. By(More)
The aim of this thesis is the discussion of mixed volumes, their interplay with algebraic geometry, discrete geometry and tropical geometry and their use in applications such as linkage configuration problems. Namely we present new technical tools for mixed volume computation, a novel approach to Ehrhart theory that links mixed volumes with counting integer(More)
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