منابع مشابه
Quadruple Points of Regular Homotopies of Surfaces in 3-manifolds
Definition 1.1. Let F be a (finite) system of closed surfaces and M a 3-manifold. A regular homotopy Ht : F →M, t ∈ [0, 1] will be called closed if H0 = H1. We will denote a closed generic regular homotopy by CGRH. The number mod 2 of quadruple points of a generic regular homotopy Ht will be denoted by q(Ht) (∈ Z/2.) Max and Banchoff in [MB] proved that any generic regular homotopy of S in R wh...
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Let F be a closed surface. If i, i′ : F → R3 are two regularly homotopic generic immersions, then it has been shown in [5] that all generic regular homotopies between i and i′ have the same number mod 2 of quadruple points. We denote this number by Q(i, i′) ∈ Z/2. For F orientable we show that for any generic immersion i : F → R3 and any diffeomorphism h : F → F such that i and i ◦ h are regula...
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Isotopic analysis can be performed on minerals, rocks, soil, tissue, gases, and liquids – just about anything. In view of the broad possibilities, we will only cover a few generalities here. In most instances, the element to be analyzed must be first isolated and purified before it can undergo isotopic analysis in a mass spectrometer. Purification is necessary to avoid isobaric interferences an...
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The thesis, together with its practice-research works, presents an objectoriented perspective on the JPEG standard. Using the object-oriented philosophy of Graham Harman as a theoretical and also practical starting point, the thesis looks to provide an account of the JPEG digital object and its enfolding within the governmental scopic regime. The thesis looks to move beyond accounts of digital ...
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ژورنال
عنوان ژورنال: Science
سال: 2005
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.307.5712.1017a