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Search Results: 1 - 10 of 380 matches for " Ramsey "
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To Sten
David Ramsey
Voices: A World Forum for Music Therapy , 2013,
$B_{\mathrm{Sen}}$ via distributions on weight space
Nick Ramsey
Mathematics , 2009,
Abstract: We introduce a certain ring of rigid-analytic distributions on $p$-adic weight space (modulo torsion) and show that it is canonically isomorphic to Colmez's ring $B_{\mathrm{Sen}}$.
Geometric and $p$-adic modular forms of half-integral weight
Nick Ramsey
Mathematics , 2009,
Abstract: We introduce a geometric formalism for studying modular forms of half-integral weight and explore some of its basic properties. Geometric Hecke operators are constructed and some basic spaces of $p$-adic forms are introduced. The $p$-adic theory is greatly expanded in subsequent papers, making that part of this paper largely obsolete.
The overconvergent Shimura lifting
Nick Ramsey
Mathematics , 2009,
Abstract: We construct a rigid-analytic map from the the author's half-integral weight cuspidal eigencurve to its integral weight counterpart that interpolates the classical Shimura lifting.
The half-integral weight eigencurve
Nick Ramsey
Mathematics , 2009,
Abstract: In this paper we define Banach spaces of overconvergent half-integral weight $p$-adic modular forms and Banach modules of families of overconvergent half-integral weight $p$-adic modular forms over admissible open subsets of weight space. Both spaces are equipped with a continuous Hecke action for which $U_{p^2}$ is moreover compact. The modules of families of forms are used to construct an eigencurve parameterizing all finite-slope systems of eigenvalues of Hecke operators acting on these spaces. We also prove an analog of Coleman's theorem stating that overconvergent eigenforms of suitably low slope are classical.
$p$-adic interpolation of square roots of central $L$-values of modular forms
Nick Ramsey
Mathematics , 2012,
Abstract: We construct a meromorphic function on the eigencurve that interpolates a square root of the ratio of the central values of two quadratic twists of the $L$-function at classical points.
Automorphisms and dilation theory of triangular UHF algebras
Christopher Ramsey
Mathematics , 2013, DOI: 10.1007/s00020-013-2037-5
Abstract: We study the triangular subalgebras of UHF algebras which provide new examples of algebras with the Dirichlet property and the Ando property. This in turn allows us to describe the semicrossed product by an isometric automorphism. We also study the isometric automorphism group of these algebras and prove that it decomposes into the semidirect product of an abelian group by a torsion free group. Various other structure results are proven as well.
Invariants Related to the Tree Property
Nicholas Ramsey
Mathematics , 2015,
Abstract: We consider global analogues of model-theoretic tree properties. The main objects of study are the invariants related to Shelah's tree property $\kappa_{\text{cdt}}(T)$, $\kappa_{\text{sct}}(T)$, and $\kappa_{\text{inp}}(T)$ and the relations that obtain between them. From strong colorings, we construct theories $T$ with $\kappa_{\text{cdt}}(T) > \kappa_{\text{sct}}(T) + \kappa_{\text{inp}}(T)$. We show that these invariants have distinct structural consequences, by investigating the decay of saturation in ultrapowers of models of $T$, where $T$ is some theory with $\kappa_{\text{cdt}}(T)$, $\kappa_{\text{sct}}(T)$, or $\kappa_{\text{inp}}(T)$ large and bounded. This answers some questions from \cite{shelah1990classification}.
Automorphisms of free products and their application to multivariable dynamics
Christopher Ramsey
Mathematics , 2014,
Abstract: We examine the completely isometric automorphisms of a free product of noncommutative disc algebras. It will be established that such an automorphism is given simply by a completely isometric automorphism of each component of the free product and a permutation of the components. This mirrors a similar fact in topology concerning biholomorphic automorphisms of product spaces with nice boundaries due to Rudin, Ligocka and Tsyganov. This paper is also a study of multivariable dynamical systems by their semicrossed product algebras. A new form of dynamical system conjugacy is introduced and is shown to completely characterize the semicrossed product algebra. This is proven by using the rigidity of free product automorphisms established in the first part of the paper. Lastly, a representation theory is developed to determine when the semicrossed product algebra and the tensor algebra of a dynamical system are completely isometrically isomorphic.
Case Report: Osteochondral Fragment—A Rare Cause of Locked Metacarpophalangeal Joint  [PDF]
Kelvin Ramsey, S. Overstall, A. Fleming
Surgical Science (SS) , 2011, DOI: 10.4236/ss.2011.26076
Abstract: We describe the presentation of a patient with sudden, sharp pain associated with a snapping sensation, swelling and pain over the metacarpophalangeal joint (MCPJ) with no history of direct trauma. The finger was held in 30 degrees of flexion and significantly deviated to the ulnar side with loss of extension. A diagnosis of traumatic rupture of the radial sagittal band of the extensor mechanism was made but the cause at exploration was found to be impingement of an osteochondral fracture fragment. This is a rare cause of irreducible loose body ‘locking’ of the metacarpophalangeal joint.
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