Mon, 28 Jan 2008

15:00 - 16:00
SR1

Some mathematics in musical harmonics

Tim Trudgian
(Mathematical Insitute, Oxford)
Abstract

A brief overview of consonance by way of continued fractions and modular arithmetic.

Mon, 19 Nov 2007

15:00 - 16:00
SR1

A digression from the zeroes of the Riemann zeta function to the behaviour of $S(t)$

Tim Trudgian
(Mathematical Insitute, Oxford)
Abstract

Defined in terms of $\zeta(\frac{1}{2} +it)$ are the Riemann-Siegel functions, $\theta(t)$ and $Z(t)$. A zero of $\zeta(s)$ on the critical line corresponds to a sign change in $Z(t)$, since $Z$ is a real function. Points where $\theta(t) = n\pi$ are called Gram points, and the so called Gram's Law states between each Gram point there is a zero of $Z(t)$, and hence of $\zeta(\frac{1}{2} +it)$. This is known to be false in general and work will be presented to attempt to quantify how frequently this fails.

Mon, 12 Nov 2007

15:00 - 16:00
SR1

An excursus in computations in deforming curves in weighted projective spaces

George Walker
(Mathematical Insitute, Oxford)
Abstract

I will review the construction of algebraic de Rham cohomology, relative de Rham cohomology, and the Gauss-Manin connection. I will then show how we can find a basis for the cohomology and the matrix for the connection with respect to this basis for certain families of curves sitting in weighted projective spaces.

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