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The First Two Eigenvalues of Large Random Matrices and Brody's Hypothesis on the Stability of Large Input-Output Systems

  • Guang-Zhen Sun

Brody (1997) notices that for large random Leontief matrices, namely non-negative square matrices with all entries i.i.d., the ratio between the subdominant eigenvalue (in modulus) and the dominant eigenvalue declines generically to zero at a speed of the square root of the size of the matrix as the matrix size goes to infinity. Since then, several studies have been published in this journal in attempting to rigorously verify Brody's conjecture. This short article, drawing upon some theorems obtained in recent years in the literature on empirical spectral distribution of random matrices, offers a short proof of Brody's conjecture, and discusses briefly some related issues.

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Article provided by Taylor & Francis Journals in its journal Economic Systems Research.

Volume (Year): 20 (2008)
Issue (Month): 4 ()
Pages: 429-432

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Handle: RePEc:taf:ecsysr:v:20:y:2008:i:4:p:429-432
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