95,505 research outputs found

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    New “Unbundling” Rules: Will the FCC Finally Open Up Cable Broadband?

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    This iBrief discusses a recent Court of Appeals decision remanding FCC rules on the unbundling of Internet services by telephone exchange carriers. These rules ordered many Internet service providers to share their equipment with competitors, so that consumers could choose their providers instead of having to accept all services from the company who installed the physical Internet connection. Cable Internet providers are not included in these rules. This iBrief predicts that cable broadband operators will soon be governed by the same unbundling provisions as other ISPs

    Preparing young talent for world cup success

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    The Structure of a Quantum World

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    I argue that the fundamental space of a quantum mechanical world is the wavefunction's space. I argue for this using some very general principles that guide our inferences to the fundamental nature of a world, for any fundamental physical theory. I suggest that ordinary three-dimensional space exists in such a world, but is non-fundamental; it emerges from the fundamental space of the wavefunction

    Identity types and weak factorization systems in Cauchy complete categories

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    It has been known that categorical interpretations of dependent type theory with Sigma- and Id-types induce weak factorization systems. When one has a weak factorization system (L, R) on a category C in hand, it is then natural to ask whether or not (L, R) harbors an interpretation of dependent type theory with Sigma- and Id- (and possibly Pi-) types. Using the framework of display map categories to phrase this question more precisely, one would ask whether or not there exists a class D of morphisms of C such that the retract closure of D is the class R and the pair (C, D) forms a display map category modeling Sigma- and Id- (and possibly Pi-) types. In this paper, we show, with the hypothesis that C is Cauchy complete, that there exists such a class D if and only if (C,R) itself forms a display map category modeling Sigma- and Id- (and possibly Pi-) types. Thus, we reduce the search space of our original question from a potentially proper class to a singleton.Comment: 14 page

    Modelling the spreading of wilding conifers

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    In many parts of the Canterbury high country, conifer seeds are spreading on the wind from exisiting plantations and shelterbelts, leading to a serious weed problem. Environment Canterbury set the task at MISG to model this spread, and thus provide a basis for prioritising control operations on a limited budget. The study group provided increased understanding of topographic and climatic factors involved in seed dispersal, and of the distribution of the resulting seed rain. In addition a simulation framework was developed for comparing the effectiveness of different control strategies
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