On Bounding Solutions of Underdetermined Systems

Sufficient conditions for the existence and uniqueness of a solution x* ∈ D ⫃ (Rn) of Y⫃(x) = 0 where ⫃ : Rn → Rm (m ≤ n) with ⫃ ∈ C2(D) where D ⫃ Rn is an open convex set and Y = ⫃′(x)+ are given, and are compared with similar results due to Zhang, Li and Shen (Reliable Computing5(1) (1999)). An algorithm for bounding zeros of f (·) is described, and numerical results for several examples are given.