#Marks for some Theorems

1. (Gershgorin Circle Theorem) Let $A$ be a comlex $n \times n$ matrix, with entries ${a_{ij}}$. For $i \in \left\{ {1, \ldots ,n} \right\}$ let ${R_i} = \sum\nolimits_{j \ne i} {\left| {{a_{ij}}} \ri

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