Henrici's transformation is a generalization of Aitken's $Δ^2$-process to the vector case. It has been used for accelerating vector sequences. We use a modified version of Henrici's transformation for solving some unconstrained nonlinear optimization problems. A convergence acceleration result is established and numerical examples are given.
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We introduce a new formulation of multiple hybrid procedures which consist in a combination of k arbitrary approximate solutions. The connection between this method and other vector sequence transformations is studied. This connection is also exploited for solving some constrained nonlinear optimization problems. A convergence acceleration result is established and numerical examples are given.
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