We review briefly the notions of periodic frameworks and periodic deformations. Then, we propose a purely geometric criterion for characterizing auxetic one-parameter deformations. Simply phrased, auxetic behavior means becoming laterally wider when stretched and thinner when compressed.
Algebraic Topology Seminar
Universidad de los Andes, Columbia
Penn State University
The classic structure of the co-operations KU(KU) of topological K-theory as a Hopf algeboid is due to Adams. In joint work with Pelaez, we determine the analogous structure for algebraic K-theory KGL, regarded as a motivic spectrum. Applying the motivic slice filtration, we solve a problem of
City University of New York (CUNY)
University of Regina