# Calendar

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
Apr
28
Thu
Undergraduate Colloquium – Nodari Sitchinava (ICS, UH Mānoa) @ Bilger 335
Apr 28 @ 3:00 pm – 3:50 pm
Sep
1
Thu
Logic seminar: Achilles Beros
Sep 1 @ 1:30 pm – Sep 1 @ 2:20 pm

Achilles Beros will
speak on “Algorithmic learning and the arithmetic hierarchy”

Summary:

I will present a theorem from my thesis that establishes the arithmetic
complexity of a well-known learning criterion. Two other papers have
been published since then that continue the line of research. I will