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Tibor Antal, Michel Droz
posted by editor (1 August 2000)
A coarse grained description of a two-dimensional prey-predator system is given in terms of a 3-state lattice model containing two control parameters: the spreading rates of preys and predators...
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G. Caldarelli, M. Piccioni, E. Sciubba
posted by editor (1 August 2000)
In this paper we test computationally the performance of CAPM in an evolutionary setting...
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Victor S. L'vov, Anna Pomyalov, Itamar Procaccia
posted by editor (1 August 2000)
Extreme events have an important role which is sometime catastrophic in a variety of natural phenomena including climate, earthquakes and turbulence, as well as in man-made environments like financial markets...
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Yasuhide Sota, Osamu Iguchi, Masahiro Morikawa, Takayuki Tatekawa, Kei-ichi Maeda
posted by editor (1 August 2000)
...These results suggest that a scale free criticality in the gravitational interaction could be the main origin to cause the universal properties such as fractal structure and non-Gaussian velocity distribution in the 3-D self-gravitating system.
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Martin Weigt, Alexander K. Hartmann
posted by editor (1 August 2000)
In this letter, we analytically describe the typical solution time needed by a backtracking algorithm to solve the vertex-cover problem on finite-connectivity random graphs...
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Damian H. Zanette, Susanna C. Manrubia
posted by editor (1 August 2000)
A stochastic model for the evolution of a growing population is proposed, in order to explain empirical power-law distributions in the frequency of family names as a function of the family size...
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Fabrizio Lillo, Rosario N. Mantegna
posted by editor (1 August 2000)
We investigate the variety of a portfolio of stocks in normal and extreme days of market activity...
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D. A. Head
posted by editor (1 August 2000)
It is argued that systems whose elements are renewed according to an extremal criterion can generally be expected to exhibit long-term memory...
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A. Arenas, A. Diaz-Guilera, R. Guimera
posted by editor (1 August 2000)
We present a simple model of communication in networks with hierarchical branching...
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Giovanni Bonanno, Fabrizio Lillo, Rosario N. Mantegna
posted by editor (1 August 2000)
The high-frequency cross-correlation existing between pairs of stocks traded in a financial market are investigated in a set of 100 stocks traded in US equity markets...
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