Förnyelse av äldre villa- och fritidsbebyggelse : prioritering och genomförande /

Abstract This note contains an application of the algebraic study by Schütt and Shioda of the elliptic modular surface attached to the commutator subgroup of the modular group. This is used here to provide algebraic descriptions of certain coverings of a j-invariant 0 elliptic curve, unramified except over precisely one point

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Decomposing Jacobians Via Galois covers

Let $phi : X o Y$ be a (possibly ramified) cover, with $X$ and $Y$ of strictly positive genus. We develop tools to identify the Prym variety of $phi$, up to isogeny, as the Jacobian of a quotient curve $C$ of the Galois closure of a composition $X o Y o P^1$ of $phi$ with a well-chosen map $Y o P^1$ that identifies branch points of $phi$. To our knowledge, this method recovers all previously obtained descriptions of Prym varieties as Jacobians. It also finds new decompositions, and for some of these, including one where $X$ has genus $3$, $Y$ has genus $1$ and $phi$ is a degree $3$ map totally ramified over $2$ points, we find an algebraic equation of the curve $C$

Kate: The Keen Android Travel Extension

Kate is a working prototype that shows that an app can assist a traveller in the travel decision process. Kate is built up from modules, the source of travel data (now the calendar) and travel time prediction (now Tripcast from Model IT) can easily be switched to another source which will require only the change of one module.Man Machine InteractionMediamaticsElectrical Engineering, Mathematics and Computer Scienc