Geodesic
Taylor Spectrum and Characteristic Functions of Commuting 2-Contractions
Serdica Mathematical Journal, Tome 34 (2008) no. 3, pp. 543-556 Cet article a éte moissonné depuis la source Bulgarian Digital Mathematics Library

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In this paper, we give a description of Taylor spectrum of commuting 2-contractions in terms of characteritic functions of such contractions. The case of a single contraction obtained by B. Sz. Nagy and C. Foias is generalied in this work.
Keywords: Characteritic Function, 2-Contraction, Taylor Spectrum 
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     author = {Bendoukha, Berrabah},
     title = {Taylor {Spectrum} and {Characteristic} {Functions} of {Commuting} {2-Contractions}},
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Bendoukha, Berrabah. Taylor Spectrum and Characteristic Functions of Commuting 2-Contractions. Serdica Mathematical Journal, Tome 34 (2008) no. 3, pp. 543-556. http://geodesic.mathdoc.fr/item/SMJ2_2008_34_3_a1/