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** Position :** Professor of Mathematics

** Office:** MacQuarrie Hall Room 418

** Office hours (August 21 -- December 9, 2019): **

- Mondays and Wednesdays 10:15-- 12:00
- by appointment via email

** Address:**

Department of Mathematics and Statistics

San Jose State University

One Washington Square

San Jose, California 95192-0103

U.S.A.

** Telephone:** 408-924-5155

** Fax :** 408-924-5080

** Email:** wasin dot so at sjsu dot edu

- B.Sc., University of Hong Kong, 1983
- M.Phil., University of Hong Kong, 1986
- Thesis : Convexity properties of state spaces of uniform algebras
- Advisor : Alan J. Ellis

- Ph.D., University of California at Santa Barbara, 1991
- Thesis : Exponential Formulas and Spectral Indices
- Advisor : Robert C. Thompson

- Postdoctoral Researcher, Institute for Mathematics and its Applications, University of Minnesota, 1991--1992.
- Postdoctoral Researcher, Center of Linear Structures and Combinatorics , University of Lisbon, 1993.
- Project NExT Fellow, 1994--1995.
- Assistant Professor, Sam Houston State University , 1992--1999.
- Visiting Researcher, Xiangtan Polytechnic University, Hunan, China, May--June 1999.
- Associate Professor, Sam Houston State University, 1999--2000.
- Associate Professor, San Jose State University, 2000 -- 2006.
- Visiting Researcher, University of Malta, Malta, July 2012.
- Visiting Researcher, Cochin University of Science and Technology, Cochin, India, March--April, 2016.
- Visiting Researcher, Nankai University, Tianjin, China, October--November, 2016.
- Visiting Researcher, Northwestern Polytechnic University, Xian, China, July, 2018.
- Professor, San Jose State University, 2006 -- present.

** Courses taught THIS semester (Fall 2019: August 21 -- December 9, 2019):**

- Math 142 Introduction to Combinatorics, section 1, MW 9:00--10:15, MH423
- For syllabus and handouts, please check your Canvas account.

- Math 142 Introduction to Combinatorics, section 2, MW 13:30--14:45, MH423
- For syllabus and handouts, please check your Canvas account.

- Math 42 Discrete Mathematics, section 3, MW 16:30--17:45, MH424
- For syllabus and handouts, please check your Canvas account.

** Courses taught before:**

- Calculus sequence:
- Discrete Mathematics sequence:
- Linear Algebra sequence:
- Probability and Statistics sequence:
- Applied Math sequence:

- Matrix Theory : the study of arrays
- Graph Theory : the study of dots and lines
- Probability Theory : the study of chances
- Number Theory : the study of integers

- On the energy and skew energy of graphs (with Wen-Huan Wang), preprint.
- On the sparsity of Jordan form (with Minh Vu), preprint.
- How many integral circulant graphs are there (with C. Cusanza), preprint.
- Solutions of $x^y=y^x$ and $x^y y^x =1$ with $0 < x < y$, preprint.
- The early development of quaternionic numerical range, preprint.
- Merging the A- and Q-spectral theories for digraphs (with Ligong Wang, Weige Xi), submitted.
- Minimizing distance signless Laplacian spectral radius of digraphs with given arc connectivity (with Ligong Wang, Weige Xi), submitted.
- On the signless Laplacian spectral radius of digraphs with given arc connectivity (with Ligong Wang, Weige Xi)
*Linear Algebra and its Applications*581 (2019) 85 -- 111. - The generalized distance matrix of digraphs (with Ligong Wang, Weige Xi)
*Linear Algebra and its Applications*577 (2019) 270 -- 286. - On the spectrum of an equitable quotient matrix and its application (with Lihua You, Man Yang, and Weige Xi),
*Linear Algebra and its Applications*577 (2019) 21--40. - Some properties of the Knodel graph W(k,2^k), k >=4 (with R. Balakrishnana, P. Paulrajab, and M. Vinayd),
*Australasian Journal of Combinatorics*74 (2019) 17--32 . - Unicyclic Graphs with Second Largest and Second Smallest Permanental Sums (with Tingzeng Wu),
*Applied Mathematics and Computation*351 (2019) 168--175. - Past publication (before 2019)

- Joint Mathematics Meetings, Denver, Colorado, January 15--18, 2020.
- "Solutions of $x^y=y^x$ and $x^y y^x =1$ with $0 < x < y$"

- Joint Mathematics Meetings, Baltimore, Maryland, January 16--19, 2019.
- "On the Spectral Radius of an Equitable Quotient Matrix"

- Past presentations (before 2019)

- Mathematics Graduate Coordinator
- Member of MA Mathematics Committee
- Member of Retention, Tenure and Promotion Committee

- Master thesis/project students
- Jane Huang,
*Image Registration and Wavelet Decomposition*, 1997 - Linda Zientek,
*Fundamental Similarity*, 1997 - David Benzel,
*Pythagorean Triples and Jasmenwozc Conjecture*, 1998 - Christopher F. Cusanza,
*Integral Circulant Graphs with the Spectral Adam Property*, 2006. Abstract - Viet Nguyen,
*Construction of Symmetric Matrices with Prescribed Spectra*, 2006. Abstract - Tue Rust,
*Understand the Cayley-Hamilton Theorem*, 2006. Abstract - Wilson Florero,
*The Search of Graphs Equienergetic with Edge Deleted Subgraph*, 2008. Abstract - Vinh Nguyen,
*Family of Circulant Graphs and its Expander Properties*, 2010. Abstract - David Zimmermann,
*The Friendship Theorem*, 2010. Abstract - Usha Watson,
*Integral Cayley Graphs over Z_2 + Z_{2p}*, 2011. Abstract - Nick Khorlin,
*A Characterization of Graphically Spectral Numbers*, 2013. Abstract - Ryan Flarity,
*Generation and Completion of Unimodular Matrices*, 2013. Abstract - Shanthi Kannan,
*Hitting Time and PageRank*, 2014. Abstract - Minh Vu,
*A Study of the Sparsity Property of the Jordan Canonical Form*, 2016. Abstract

- Jane Huang,
- Referee for the following journals
- Linear Algebra and its Applications
- Linear and Multilinear Algebra
- SIAM Journal on Matrix Analysis and Applications
- Electronic Journal of Linear Algebra
- American Mathematical Monthly
- Discrete Mathematics

- Reviewer of Mathematical Reviews
- Examiner of
- University of Hong Kong, Hong Kong
- Hong Kong Baptist University, Hong Kong
- Bharathidasan University, India

- Co-organizer of the following meetings:
- 1999 Conference on Multiwavelets: theory and applications, Huntsville, Texas
- 2001 Southern California Matrix Conference, San Jose, California
- 2004 Southern California Matrix Conference, San Jose, California
- 2005 R. C. Thompson Matrix Conference, San Francisco, California
- 2007 R. C. Thompson Matrix Conference, Auburn, Alabama

- Judge of the following math/science fair
- 2001 Intel Science Fair
- 2002, 2003, 2004 MAA Math Undergrad Poster

- AP Statistics reader
- 2004, 2005, 2007, 2009

- Linear Algebra and its Applications
- Linear and Multilinear Algebra
- SIAM Journal Matrix Analysis and Applications
- Numerical Linear Algebra with Applications
- Electronic Journal of Linear Algebra

- American Mathematical Society (AMS)
- Mathematical Association of America (MAA)
- Society of Industrial and Applied Mathematics (SIAM)
- International Linear Algebra Society (ILAS)

- Institute for Pure and Applied Mathematics (IPAM)
- The Mathematical Sciences Research Institute (MSRI)
- The American Institute of Mathematics (AIM)
- The Clay Mathematics Institute (CMI)
- Institute for Mathematics and its Applications (IMA)
- Center for Discrete Mathematics and Computer Science (DIMACS)
- Mathematical Biosciences Institute (MBI)