Istituto di Scienza e Tecnologie dell'Informazione     
Arioli M., Favati P. Some results on quasi-Newton methods. Internal note IEI-B4-84, 1986.
A necessary and sufficient condition so that Broyden and Greenstadt updates will result equa1 is given. Furthermore, explicit forms of the Greenstadt methods, related to Broyden methods with 8 ∊ {0,1},are presented. Finally, some remarks on the Huang symmetric fami1y are given.
Subject 65K05 Mathematical programming methods

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