Abstract
1.Introduction and summary. This paper offers yet another example of what probability theory can do for analysis. Using a Feynman-Kac formula derived in the theory of random evolutions (5), we find an expression (1) for the spectral radiusr(A) of a finite square non-negative matrixA. This expression makes it very easy to study howr(A) behaves as a function of the diagonal elements ofA.

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