John Winston Spellmann Professor of Mathematics Office: Math/CS 479 Phone: 512-245-3422 Fax: 512-245-3425 Email: js20@txstate.edu

Research Interests: Differential Equations, Computation.

Professor Spellmann received his Ph.D. from Emory University in 1968. His recent research has been in Iterative Methods to produce row stochastic matrices.

Selected Publications

• J. W. Spellmann, R. M. Torrejon,; Concerning triangle preserving functions, Texas J. of Sci. 59 (2), (2007), 83-96.
• J. W. Spellmann, S. G. Wayment; Functions which cycle through composition to the identity function. Texas J. Sciences 55(4): 297-306, 2003.
• J. W. Spellmann. Product integral techniques for abstract hyperbolic partial differential equations. Trans. Amer. Math. Soc., 209:353--365, 1975.
• D. J. Hartfiel and J. W. Spellmann. Diagonal similarity of irreducible matrices to row stochastic matrices. Pacific J. Math., 40:97--99, 1972.
• D. J. Hartfiel and J. W. Spellmann. A role for doubly stochastic matrices in graph theory. Proc. Amer. Math. Soc., 36:389--394, 1972.
• J. W. Spellmann. Concerning the domains of generators of linear semigroups. Pacific J. Math., 35:503--509, 1970.
• J. W. Spellmann. Concerning the infinite differentiability of semigroup motions. Pacific J. Math., 30:519--523, 1969.