3,075 research outputs found
The impact of Stieltjes' work on continued fractions and orthogonal polynomials
Stieltjes' work on continued fractions and the orthogonal polynomials related
to continued fraction expansions is summarized and an attempt is made to
describe the influence of Stieltjes' ideas and work in research done after his
death, with an emphasis on the theory of orthogonal polynomials
A two-variable series for knot complements
The physical 3d theory T[Y] was previously used to predict
the existence of some 3-manifold invariants that take the form
of power series with integer coefficients, converging in the unit disk. Their
radial limits at the roots of unity should recover the
Witten-Reshetikhin-Turaev invariants. In this paper we discuss how, for
complements of knots in , the analogue of the invariants
should be a two-variable series obtained by parametric resurgence
from the asymptotic expansion of the colored Jones polynomial. The terms in
this series should satisfy a recurrence given by the quantum A-polynomial.
Furthermore, there is a formula that relates to the invariants
for Dehn surgeries on the knot. We provide explicit
calculations of in the case of knots given by negative definite
plumbings with an unframed vertex, such as torus knots. We also find
numerically the first terms in the series for the figure-eight knot, up to any
desired order, and use this to understand for some hyperbolic
3-manifolds.Comment: 79 pages; final version, to appear in Quantum Topolog
Elliptic Hypergeometric Laurent Biorthogonal Polynomials with a Dense Point Spectrum on the Unit Circle
Using the technique of the elliptic Frobenius determinant, we construct new
elliptic solutions of the -algorithm. These solutions can be interpreted as
elliptic solutions of the discrete-time Toda chain as well. As a by-product, we
obtain new explicit orthogonal and biorthogonal polynomials in terms of the
elliptic hypergeometric function . Their recurrence coefficients
are expressed in terms of the elliptic functions. In the degenerate case we
obtain the Krall-Jacobi polynomials and their biorthogonal analogs
Bi-orthogonal systems on the unit circle, Regular Semi-Classical Weights and Integrable Systems - II
We derive the Christoffel-Geronimus-Uvarov transformations of a system of
bi-orthogonal polynomials and associated functions on the unit circle, that is
to say the modification of the system corresponding to a rational modification
of the weight function. In the specialisation of the weight function to the
regular semi-classical case with an arbitrary number of regular singularities the bi-orthogonal system is known to be isomonodromy
preserving with respect to deformations of the singular points. If the zeros
and poles of the Christoffel-Geronimus-Uvarov factors coincide with the
singularities then we have the Schlesinger transformations of this
isomonodromic system. Compatibility of the Schlesinger transformations with the
other structures of the system - the recurrence relations, the spectral
derivatives and deformation derivatives is explicitly deduced. Various forms of
Hirota-Miwa equations are derived for the -functions or equivalently
Toeplitz determinants of the system.Comment: to appear J. Approx. Theor
PICES Press, Vol. 16, No. 2, July 2008
The 2008 Inter-Sessional Science Board Meeting (pp.1-2, pdf, 0.1 Mb)
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