On the function “sandwiched" between and .
Dobrynin, V.Y. (1997)
The Electronic Journal of Combinatorics [electronic only]
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Dobrynin, V.Y. (1997)
The Electronic Journal of Combinatorics [electronic only]
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Coolsaet, Kris, Degraer, Jan, Spence, Edward (2006)
The Electronic Journal of Combinatorics [electronic only]
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Grolmusz, Vince (2000)
The Electronic Journal of Combinatorics [electronic only]
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Sorensen, Danny C., Zhou, Yunkai (2003)
Journal of Applied Mathematics
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Jitka Segethová (1972)
Aplikace matematiky
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Wang, Jonathan (2010)
The Electronic Journal of Combinatorics [electronic only]
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Miroslav Tůma (1988)
Aplikace matematiky
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Necessity of computing large sparse Hessian matrices gave birth to many methods for their effective approximation by differences of gradients. We adopt the so-called direct methods for this problem that we faced when developing programs for nonlinear optimization. A new approach used in the frame of symmetric sequential coloring is described. Numerical results illustrate the differences between this method and the popular Powell-Toint method.