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A discrete mathematical method, based on the Jakó Iterative Canonical Forms (ICF) of Boolean functions is proposed for the analysis of species combinations and the detection of characteristic areas in plant communities. Information on species combinations (or florulas) appearing in a sample is expressed in compact form to reveal fundamental properties of community pattern. The new method provides a complementary tool for the florula diversity approach: whereas florula diversity is indicative of the frequency distribution of species combinations regardless their interrelationships, the new procedure detects complexity in the abstract structure of species combinations. Graph-theoretical representations of the ICF promote understanding the new method and visualizing its results. A cellular automata model and field data provide illustrative examples.

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. Molecular Evolution. A Phylogenetic Approach. Dale, M. B. 2000. On plexus representations of dissimilarities. Community Ecology 1. On plexus

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Galizia, C. G., Sachse, S., Rappert, A., Menzel, R. (1999) The glomarular code for odor representations is species-specific in the honeybee Apis mellifera . Nat. Neurosci. 2 , 473

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23 35 Culik II, K. and H. A. Maurer. 1978. String representations of graphs. Internt. J. Computer Math. Sect. A 6: 272-301. String representations

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Lerner, Y., Pianka, P., Azmon, B., Leiba, H., Stolovitch, C., Loewenstein, A., Harel, M., Hendler, T., Malach, R. (2003) Area-specific amblyopic effects in human occipitotemporal object representations. Neuron 40 , 1023

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851 Bar-Yam, Y. 2002. Sum rule for multiscale representations of kinematically described systems. Advances in Complex Systems 5: 409-431. Sum rule for multiscale

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. 1982 7 75 89 Baccini, A. 1984. Étude comparative des representations graphiques en analyses factorielles des correspondances simples

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57 63 Bar-Yam, Y. 2002. Sum rule for multiscale representations of kine-matically described systems. Advances in Complex Systems 5:409-431. Sum rule

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Dor, D. (1996): Representations, Attitudes and Factivity Evaluations: An Epistemically Based Analysis of Lexical Selection. Stanford University Dissertation. Dor, D. (2000a): Towards a semantic account of strong island

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should have created equal neuronal representations, coding the observed actions and emotions. In addition, the neuropeptide oxytocin (OT), which is produced in the hypothalamus and released into the bloodstreams by the posterior pituitary gland, plays an

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