Positivity of Schubert vs. Schur Coefficients
With Sami Assaf and Nantel Bergeron


Investigation of some lower bounds related to the Shapiro Conjecture.
Description and data

The Secant Conjecture (Very much a work in progress)
official page
Overlap number.


Some Combinatorial Hopf Algebras.
Work with Marcelo Aguiar,
Nantel
Bergeron, and Aaron Lauve.
July 2008.












A nontrivial real system that cannot be
controlled by real output feedback.
With Joachim Rosenthal.
September 1997.
