1991 Texas Patiral Differential Equations Seminar
Southwest Texas State University, San Marcos.

Saturday March 30, 1991. (In order of presentation).
• R. Shivaji: Mississippi State Univ.; An existence result for a class of sempositone problems via an antimaximum principle.
• B. Lowe: Texas A&M Univ.; The recovery of potentials from finite spectral data.
• C.L. Bosman: Exxon Production Research Company; An integral representation of a scattered acoustic signal in the presence of caustics.
• W. Richardson: Univ. of Texas at San Antonio; Krylov subspace methods for a large reaction-diffusion system.
• C.B. Martin*: Univ. of Houston; The long time behavior of solutions to a quasilinear combustion model.
• J. Su: Univ. of Texas at Arlington; Delay oscillation phenomena in FitzHugh Nagumo equation.
  Lunch break
• R. Kannan: Univ. of Texas at Arlington; Forced oscillation of nonlinear rotating beams.
• R. H. Fabiano: Texas A&M Univ.; Approximation for equations in linear viscoelasticity.
• J.G. Dix: Southwest Texas State Univ.; A wave equation with memory.
• D.T. Smith: Univ. of North Texas; Existence, nonexistence, and other properties of nonlinear elliptic equations of fourth order.
• S. Gadam: Univ. of North Texas; Monotonicity of the forcing term and existence and degeneracy of positive solutions for a class of semilinear elliptic problems.
• J. Cossio: Univ. of North Texas; Existence of multiple solutions for a semilinear elliptic problem in a ball.
• X. Xu: Univ. of Arkansas; An elliptic-parabolic system of degenerate type.
• H.J. Nussenzveig Lopes: Univ. of California at Berkeley; An estimate on the Hausdorff dimension of a concentration set for incompressible 2D Euler equations.
• A.J. Lyberopoulos: Univ. of Oklahoma; Riemann invariants, increase of entropy, and weak a-priori estimates for hyperbolic balance laws.