Date of Award


Document Type


Degree Name

Master of Science


Department of Mathematics and Statistics

First Advisor

Aihua W. Wood, PhD


We consider the semilinear elliptic equation Δu = p(x)uα + q(x)uβ on a domain Ω ⊆ Rn, n ≥ 3, where p and q are nonnegative continuous functions with the property that each of their zeroes is contained in a bounded domain Ωp or Ωq, respectively in Ω such that p is positive on the boundary of Ωp and q is positive on the boundary of Ωq. For Ω bounded, we show that there exists a nonnegative solution u such that u(x) → ∞ as x → ∂Ω if 0 < α ≤ β, β > 1, and that such a solution does not exist if 0 < α ≤ β ≤ 1. For Ω = Rn, we established conditions on p and q to guarantee the existence of a nonnegative solution u satisfying u(x) → ∞ as the |x| → ∞ for 0 < α ≤ β, β > 1, and for 0 < α is ≤ β ≤ 1. For Ω=Rn and 0 < α ≤ β < 1, we also establish conditions on p and q for the existence and nonexistence of a solution of u where u is bounded on Rn.

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