Qi  has given a theorem which guarantees the existence and uniqueness of a zero x* of a function f : Rn → Rn in a bounded closed rectangular convex set [x] ⊂ Rn under more general sufficient conditions than those described by Moore  and has defined an operator (the so-called second-derivative operator) together with a test, involving the second-derivative operator, for the existence but not the uniqueness of a zero x* of f in [x].
Reliable Computing – Springer Journals
Published: Oct 14, 2004
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