Journal
ISRAEL JOURNAL OF MATHEMATICS
Volume 131, Issue -, Pages 125-137Publisher
MAGNES PRESS
DOI: 10.1007/BF02785853
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We prove an elementary formula about the average expansion of certain products of 2 by 2 matrices. This permits us to quickly re-obtain an inequality by M. Herman and a theorem by Dedieu and Shub, both concerning Lyapunov exponents. Indeed, we show that equality holds in Herman's result. Finally, we give a result about the growth of the spectral radius of products.
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