Mar

10

Thu

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

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

Title: A brief overview of topological data analysis

Sep

1

Thu

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

discuss the newer papers as well as broader connections between

recursion theory and learning theory.

Keller Hall 303

Sep

8

Thu

This week the Sporadic Logic Seminar will be Mushfeq Khan speaking on

“Turing degrees and Muchnik degrees of recursively

bounded DNR functions”.

Summary:

This talk is based on a forthcoming paper by Steve Simpson. It contains

some results that shed light on a part of the Muchnik lattice that remains

poorly understood: the various degrees of recursively bounded DNR functions

obtained by varying the recursive bound.

Keller 303

## University of Hawaiʻi at Mānoa