Interview: Nate Larson

Silver Bullet Talks with Nate Fick

A Nate on Dynamics and Kinematics*

At the Fourth International Conference on Event Perception and Action in Trieste this past summer. Karl Newell. Bruce Kay. and I had a brief discussion in which we agreed upon a need for clarification of the meaning and use of the term "dynamic." The concern was that there may be some confusion because "dynamic" is used in nontechnical parlance to denote activity or change. In this usage. "dyna...

Grossman-Larson Hopf algebras built on rooted trees

In [8], Dirk Kreimer discovered the striking fact that the process of renormalization in quantum field theory may be described, in a conceptual manner, by means of certain Hopf algebras (which depend on the chosen renormalization scheme). A toy model was studied in detail by Alain Connes and Dirk Kreimer in [3]; the Hopf algebra which occurs, denoted by HR, is the polynomial algebra in an infin...

JALDA's Interview with Peter Mühlhäusler

Peter Mühlhäusler is the Foundation Professor of Linguistics at the University of Adelaide, and Supernumerary Fellow of Linacre College, Oxford. He has taught at the Technical University of Berlin and in the University of Oxford. He is an active researcher in several areas of linguistics, including ecolinguistics, language planning, and language policy and language contact in the Australian-Pac...

Sequences that satisfy a ( n − a ( n ) ) = 0 Nate

We explore the properties of some sequences for which a(n − a(n)) = 0. Under the natural restriction that a(n) < n the number of such sequences is a Bell number. Adding other natural restrictions yields sequences counted by the Catalan numbers, the Narayana numbers, the triangle of triangular binomial coefficients, and the Schröder numbers.