Previous Conferences & Workshops

Oct
18
2010

Computer Science/Discrete Mathematics Seminar I

A Unified Framework for Testing Linear-Invariant Properties
Arnab Bhattacharyya
11:15am|S-101

In a sequence of recent papers, Sudan and coauthors have investigated the relation between testability of properties of Boolean functions and the invariance of the properties with respect to transformations of the domain. Linear-invariance is...

Oct
14
2010

Joint IAS/Princeton University Number Theory Seminar

Even Galois Representations and the Fontaine-Mazur conjecture
Frank Calegari
4:30pm|S-101

Fontaine and Mazur have a remarkable conjecture that predicts which (p-adic) Galois representations arise from geometry. In the special case of two dimensional representations with distinct Hodge-Tate weights, they further conjecture that these...

Oct
14
2010

Galois Representations and Automorphic Forms Seminar

The Fundamental Curve of p-Adic Hodge Theory
2:15pm|S-101

Let $\overline K$ be an algebraic closure of a $p$-adic field $K$. We construct a separated noetherian regular scheme $X$ (nonalgebraic) equipped with an action of $G_K=\mathrm{Gal}(\overline{K}/K)$. We have $H^0(X, O_X) = Q_p$ and $H_1(X, O_X) = 0$...

Oct
13
2010

Galois Representations and Automorphic Forms Mini-Course

The Completed Cohomology of Arithmetic Groups
Frank Calegari
1:30pm|S-101

The cohomology of arithmetic groups (with real coefficients) is usually understood in terms of automorphic forms. Such methods, however, fail (at least naively) to capture information about torsion classes in integral cohomology. We discuss a...

Oct
12
2010

Computer Science/Discrete Mathematics Seminar II

Approximating the Longest Increasing Subsequence in Polylogarithmic Time
10:30am|S-101

Finding the longest increasing subsequence (LIS) is a classic algorithmic problem. Simple O(n log n) algorithms, based on dynamic programming, are known for solving this problem exactly on arrays of length n. In this talk I'll discuss recent work of...

Oct
11
2010

Members’ Seminar

Symplectic Homogenization
2:00pm|S-101

Given a Hamiltonian on $T^n\times R^n$, we shall explain how the sequence of suitably rescaled (i.e. homogenized) Hamiltonians, converges, for a suitably defined symplectic metric. We shall then explain some applications, in particular to symplectic...

Oct
11
2010

Computer Science/Discrete Mathematics Seminar I

The Complexity of the Non-commutative Determinant
11:15am|S-101

I will talk about the computational complexity of computing the noncommutative determinant. In contrast to the case of commutative algebras, we know of (virtually) no efficient algorithms to compute the determinant over non-commutative domains. Our...