32 research outputs found

    Weighted lattice point sums in lattice polytopes, unifying Dehn-Sommerville and Ehrhart-Macdonald

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    Let VV be a real vector space of dimension nn and let M⊂VM\subset V be a lattice. Let P⊂VP\subset V be an nn-dimensional polytope with vertices in MM, and let \varphi\colon V\rightarrow \CC be a homogeneous polynomial function of degree dd (i.e., an element of \Sym^{d} (V^{*})). For q\in \ZZ_{>0} and any face FF of PP, let Dφ,F(q)D_{\varphi ,F} (q) be the sum of φ\varphi over the lattice points in the dilate qFqF. We define a generating function G_{\varphi}(q,y) \in \QQ [q] [y] packaging together the various Dφ,F(q)D_{\varphi ,F} (q), and show that it satisfies a functional equation that simultaneously generalizes Ehrhart--Macdonald reciprocity and the Dehn--Sommerville relations. When PP is a simple lattice polytope (i.e., each vertex meets nn edges), we show how GφG_{\varphi} can be computed using an analogue of Brion--Vergne's Euler--Maclaurin summation formula

    Revisiting Knowledge, Skills, and Abilities Needed for Development and Delivery Project Staff

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    This paper is grounded on the proposition that quality and timeliness of provisioning business information system solutions can be advanced by staffing development projects with personnel based on appropriate task related Knowledge, Skills, Abilities and Personal Characteristics (KSA-P). Defining a standard repeatable process for such staffing decisions requires a consistent classification scheme for the KSA-Ps, which this paper develops through a meta-analysis of the relevant literature. A nominal group of CIOs and consulting principals provide additional support for the validity of the classification scheme. The role of general and specific experience in skill and ability development is explored. Implications and future directions of the research are discussed

    Temperature Dependence Of Wood Surface Energy

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    A thorough understanding of the wood surface is required to engineer adhesive bonding in composite applications. A surface analysis technique, dynamic contact angle (DCA) analysis, was used to examine the effects of temperature on the wood surface as measured by the contact angle and surface energy. A hydrophobic surface transition was found on the wood surface at 60 C, which coincides with the glass transition of lignin as measured by differential scanning calorimetry. The change in the surface at the glass transition can be attributed to the diffusion of nonpolar molecular groups to the surface. This could be the result of the migration and deposition of extractives, reorientation of macromolecules, or a combination of the two. Similar behavior has been observed in synthetic amorphous polymers. Although the surface of wood is complex, the results indicate that it can be investigated and understood like synthetic polymer materials

    Computing automorphic forms on Shimura curves over fields with arbitrary class number

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    We extend methods of Greenberg and the author to compute in the cohomology of a Shimura curve defined over a totally real field with arbitrary class number. Via the Jacquet-Langlands correspondence, we thereby compute systems of Hecke eigenvalues associated to Hilbert modular forms of arbitrary level over a totally real field of odd degree. We conclude with two examples which illustrate the effectiveness of our algorithms.Comment: 15 pages; final submission to ANTS I

    On Witten multiple zeta-functions associated with semisimple Lie algebras IV

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    In our previous work, we established the theory of multi-variable Witten zeta-functions, which are called the zeta-functions of root systems. We have already considered the cases of types A2A_2, A3A_3, B2B_2, B3B_3 and C3C_3. In this paper, we consider the case of G2G_2-type. We define certain analogues of Bernoulli polynomials of G2G_2-type and study the generating functions of them to determine the coefficients of Witten's volume formulas of G2G_2-type. Next we consider the meromorphic continuation of the zeta-function of G2G_2-type and determine its possible singularities. Finally, by using our previous method, we give explicit functional relations for them which include Witten's volume formulas.Comment: 22 pag

    Hecke operators and Hilbert modular forms Hecke operators and Hilbert modular forms

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    Abstract. Let F be a real quadratic field with ring of integers Ø and with class number 1. Let Γ be a congruence subgroup of GL2(Ø). We describe a technique to compute the action of the Hecke operators on the cohomology H 3 (Γ ; C). For F real quadratic this cohomology group contains the cuspidal cohomology corresponding to cuspidal Hilbert modular forms of parallel weight 2. Hence this technique gives a way to compute the Hecke action on these Hilbert modular forms

    Wonderful blowups associated to group actions

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    Toric modular forms and nonvanishing of L-functions

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