Interests  Exponential Theory exponential formulas exponential inequalities Spectral Theory Eigenvalues inequalities for Hermitian matrices Singular values inequalities for general square matrices Quaternionic Theory quaternionic polynomials quaternionic eigenvalues quaternionic numerical ranges Norm Theory isometry groups facial structures of unit ball isometric isomorphisms Multiwavelet Theory support properties of scaling vector matrix symbols of scaling vector Graph Theory Laplacian spectrum of a graph Preserver Theory linear preserver problems Preprint and Recent Publication The high road to an exponential formula. Quadratic formulas for quaternions, with Liping Huang, Applied Mathematics Letters 15 (2002) 533-540. Past publication (before 2002) Upcoming and Recent Presentation 12th Conference of the International Linear Algebra Society at Regina, Canada (July 2005) 11th Conference of the International Linear Algebra Society at Coimbra, Portugal (July 2004) Joint Mathematics Meeting at Phoenix (January 2004) Joint Mathematics Meeting at Baltimore (January 2003) Left eigenvalues of a quaternionic Matrix CSU Hayward Colloquium (January 18, 2002) Matrices and Graphs: a two-way street  Joint Mathematics Meeting at San Diego (January 2002) On preserving structured matrices using double bracket operators  Past presentations  (before 2002) SJSU Matrix Seminar (Summer 2002) Enumeration of spectral triples Computation of graph spectra Previous topics