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.
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
Speaker: John “Curlee” Robertson, University of Hawaii
Title: Analytical Techniques in Measurable Group Theory
Abstract: Measurable Group Theory is a relatively new tool created to recover information about countable groups. We will introduce what it means to be “measure equivalent”, give some examples (and some non-examples), and talk about how this helps us view our groups from the angle of unitary operators on a Hilbert space. More specifically, for two measure equivalent groups a unitary representation of one induces a unitary representation of the other in a “geometry preserving” way. I’ll give a few short proofs and draw some nice pictures. Needless to say, this should be accessible to all.
See organizers Rufus, Alan or Robin for details.
Title: A brief overview of topological data analysis
See organizers Rufus, Alan or Robin for details.