Word Count : 221

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For estimating the eigenvalues of a matrix using Gerschgorin bounds, each eigenvalue lies within at least one of the Gerschgorin discs. Consider a square matrix $A = [a_{ij}]$ of order $n$. The Gerschgorin discs are defined for each row as $D_i = \{z \in _______ ________ _______ _____ _____ ___ _________ ___ _____ ________ _____.
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