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Welcome to Wasin So's Homepage

Position : Professor of Mathematics

Office: MacQuarrie Hall Room 418

Office hours (July 8, 2019 -- August 9, 2019):

• MoTuWeTh 10:05-- 11:00
• 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

Education

• 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

Academic Experience

• 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.

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Courses taught THIS semester (Summer 2019: July 8 -- August 9, 2019):

• Math 129A Linear Algebra I, section 1, MoTuWeThFr 8:30--10:05, MH234
  • If you want to enroll in this class, please do it before June 6.
  • If you have questions, please email me.

Courses taught NEXT 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:
  • MATH 30 Calculus I
  • MATH 32 Calculus III
• Discrete Mathematics sequence:
  • MATH 42 Discrete Mathematics
  • MATH 108 Introduction to abstract Mathematics and Proofs
  • MATH 179 Introduction to Graph Theory
  • MATH 142 Introduction to Combinatorics
  • MATH 279A Graph Theory
  • MATH 279B Advanced Graph Theory
• Linear Algebra sequence:
  • MATH 129A Linear Algebra I
  • MATH 129B Linear Algebra II
  • MATH 229 Advanced Matrix Theory
  • MATH 285 Matrices and Graphs
• Probability and Statistics sequence:
  • MATH 161A Applied Statistics I
  • MATH 163 Probability Theory
• Applied Math sequence:
  • MATH 203 CAMCOS Project

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Interests :

• 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

Ongoing Projects, Preprints, and Recent Publications :

• 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 $x^y=y^x$ with $0 < x < y$, 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), submitted.
• 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)

Upcoming meetings and Recent Presentations:

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