Nuclear Science and Engineering / Volume 41 / Number 3 / September 1970 / Pages 399-403
Technical Paper / dx.doi.org/10.13182/NSE70-A19098
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N-step iterative processes give rise to N-order variational principles. The þ-hyperpower iterative process of Altman and Petryshyn is shown to be equivalent to the þ-order variational principle of Kostin and Brooks. A higher order Chebychev variational principle is derived, which is independent of the normalization of the trial operator.