Geodesic
Spectra of the difference, sum and product of idempotents
Mohamed Barraa1 ; Mohamed Boumazgour1
1Département de Mathématiques Faculté des Sciences Semlalia B.P. 2390 Marrakech, Maroc
Studia Mathematica, Tome 148 (2001) no. 1, pp. 1-3
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We give a simple proof of the relation between the spectra of the difference and product of any two idempotents in a Banach algebra. We also give the relation between the spectra of their sum and product.
DOI : 10.4064/sm148-1-1
Keywords: simple proof relation between spectra difference product idempotents banach algebra relation between spectra their sum product

Mohamed Barraa  1   ; Mohamed Boumazgour  1

1 Département de Mathématiques Faculté des Sciences Semlalia B.P. 2390 Marrakech, Maroc 
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Mohamed Barraa; Mohamed Boumazgour. Spectra of the difference, sum and product of idempotents. Studia Mathematica, Tome 148 (2001) no. 1, pp. 1-3. doi: 10.4064/sm148-1-1

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