5,233,676 research outputs found

    A Simple Introduction to Grobner Basis Methods in String Phenomenology

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    In this talk I give an elementary introduction to the key algorithm used in recent applications of computational algebraic geometry to the subject of string phenomenology. I begin with a simple description of the algorithm itself and then give 3 examples of its use in physics. I describe how it can be used to obtain constraints on flux parameters, how it can simplify the equations describing vacua in 4d string models and lastly how it can be used to compute the vacuum space of the electroweak sector of the MSSM.Comment: 13 pages, Prepared for Mathematical Challenges in String Phenomenology, ESI Vienna, Austria, Oct 6-15, 200

    Are Eyebrows Going to Be Talked of in Connection with the Eye of God? Wittgenstein and Certainty in the Debate between Science and Religion

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    In this paper I will argue that we can chart such a middle course through an exploration of Ludwig Wittgensteinā€™s thought (particularly that advanced in On Certainty and Lectures and Conversations on Aesthetics, Psychology and Religious Belief). I will use his thesis that meaning and certainty are context dependent to investigate how meaning is produced in science and in religion. I will start with the recognition that any system of thought must take certain basic propositions as criteria for further investigation and explore how Wittgenstein defines this idea. Next I will try to establish that religion and science do, indeed, function as two different systems or language games by illustrating their differing criteria for truth. In so doing I will reference both Wittgensteinā€™s works and that of some anthropologists of religion, whose work has explored a definition of religion through its use, which mirrors Wittgensteinā€™s location of meaning. I will then discuss how we can pick between systems within a given context by requiring that a system stand up to the criteria of justification set up for that situation

    What normative terms mean and why it matters for ethical theory

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    This paper investigates how inquiry into normative language can improve substantive normative theorizing. First I examine two dimensions along which normative language differs: ā€œstrengthā€ and ā€œsubjectivity.ā€ Next I show how greater sensitivity to these features of the meaning and use of normative language can illuminate debates about three issues in ethics: the coherence of moral dilemmas, the possibility of supererogatory acts, and the connection between making a normative judgment and being motivated to act accordingly. The paper concludes with several brief reflections on the theoretical utility of the distinctionā€”at least so-calledā€”between ā€œnormativeā€ and ā€œnon-normativeā€ language and judgment. Clarifying the language we use in normative conversation and theorizing can help us diagnose problems with bad arguments and formulate better motivated questions. This can lead to clearer answers and bring into relief new theoretical possibilities and avenues to explore

    PuLSE-I: Deriving instances from a product line infrastructure

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    Reusing assets during application engineering promises to improve the efficiency of systems development. However, in order to benefit from reusable assets, application engineering processes must incorporate when and how to use the reusable assets during single system development. However, when and how to use a reusable asset depends on what types of reusable assets have been created.Product line engineering approaches produce a reusable infrastructure for a set of products. In this paper, we present the application engineering process associated with the PuLSE product line software engineering method - PuLSE-I. PuLSE-I details how single systems can be built efficiently from the reusable product line infrastructure built during the other PuLSE activities

    Fan Charts as Useful ā€˜Mapsā€™ for an Inflation-Targeting Central Bank: An Illustration of the Sveriges Riksbankā€™s Method for Presenting Density Forecasts of Inflation

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    In this study I illustrate the usefulness of Fan Charts for a central bank and show how they can be used to present its viewpoint on likely paths of future inflation. Exploiting a bivariate unobserved components model, I use the methodology followed by Blix and Sellin (1998) to demonstrate how subjective judgements can be systematically incorporated into model-based forecasts and effectively presented in a graphic manner.

    Embedding object-oriented design in system engineering

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    The Unified Modeling Language (UML) is a collection of techniques intended to document design decisions about software. This contrasts with systems engineering approaches such as for exampleStatemate and the Yourdon Systems Method (YSM), in which the design of an entire system consisting of software and hardware can be documented. The difference between the system- and the software level is reflected in differences between execution semantics as well as in methodology. In this paper, I show how the UML can be used as a system-level design technique. I give a conceptual framework for engineering design that accommodates the system- as well as the software level and show how techniques from the UML and YSM can be classified within this framework, and how this allows a coherent use of these techniques in a system engineering approach. These ideas are illustrated by a case study in which software for a compact dynamic bus station is designed. Finally, I discuss the consequences of this approach for a semantics of UML constructs that would be appropriate for system-level design
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