Calendar

Feb
11
Thu
Undergraduate Colloquium – Asaf Hadari (UH Mānoa) @ Bilger 335
Feb 11 @ 3:00 pm – 4:00 pm

Speaker: Asaf Hadari (UH Mānoa)

Title: Hilbert’s third problem – how to cut and paste using linear algebra

Abstract: In the year 1900 the mathematician David Hilbert famously gave a list of 21 problems that he felt were the most important challenges facing the mathematical community of the day.

The third problem, though stated differently, essentially asked whether it was necessary to use calculus to do basic geometry in three dimensions. For instance, is there a geometric way to calculate the volume of a pyramid?

This was the first of his problems that was answered, using a neat idea from linear algebra. I’ll show you how, and discuss some of the neat mathematics surrounding this problem.

Feb
23
Tue
Theory of Computation Seminar @ Physical Science Building 317
Feb 23 @ 2:20 pm – 3:00 pm

Jason Castiglione (ICS, UH-Manoa) will explain the Berlekamp-Massey algorithm for decoding pseudorandom output from a linear feedback state register.

Mar
3
Thu
Undergraduate colloquium – Chris Nowlin (NSA) @ Bilger 335
Mar 3 @ 3:00 pm – 4:00 pm

Speaker: Chris Nowlin (NSA)

Title: Mathematics at NSA

Abstract: We will discuss career opportunities for mathematicians at the National Security Agency. The speaker will share reflections on his 5-year career, including the application process, the types of problems NSA mathematicians work on, and some of the good and the bad associated with working for NSA. Questions from the audience are encouraged.

Mar
10
Thu
Undergraduate Colloquium – Janet Becker (SOEST, UH Mānoa) @ Bilger 335
Mar 10 @ 3:00 pm – 3:50 pm

Title: Wave driven inundation for reef fringed atolls

Speaker: Prof. Janet M. Becker, Department of Geology and Geophysics

Abstract: As sea level rises, the threat of wave driven inundation for low lying atolls is anticipated to increase. Wave driven inundation results from three dynamically distinct components: sea and swell energy, breaking wave setup, and low frequency (infragravity) energy. Here, results from field experiments in Ipan, Guam and Majuro and Roi-Namur, RMI are presented that demonstrate the importance of low frequency energy on fringing reefs. The observations are described in terms of linear and nonlinear dynamics. Projections of wave driven inundation that include all components for Roi-Namur under future sea level scenarios are presented.

Mar
15
Tue
Kostas Beros: Normal numbers and a completeness result in the difference hierarchy
Mar 15 @ 2:30 pm – 3:30 pm

Speaker: Kostas Beros (U. North Texas)

Title: Normal numbers and a completeness result in the difference hierarchy

Abstract: In this talk I consider a natural set of real numbers, arising in ergodic theory, and show that it is Wadge-complete for the class of differences of $F_{\sigma\delta}$ sets. I will recall basic definitions and motivate my result with a discussion of related theorems from the past twenty years.

Logic seminar

Keller Hall 401

Mar
17
Thu
Undergraduate Colloquium – Yuriy Mileyko (UH Mānoa) @ Bilger 335
Mar 17 @ 3:00 pm – 3:50 pm

Title: A brief overview of topological data analysis

Apr
7
Thu
Mushfeq Khan: The cupping property @ Keller Hall 314
Apr 7 @ 2:30 pm – 3:30 pm
Apr
14
Thu
Mushfeq Khan: The Cupping Property (cont’d) @ Keller Hall 314
Apr 14 @ 2:30 pm – 3:30 pm