If, in the Gershgorin circle theorem for a given ,
for all , then exactly one eigenvalue of lies in the disk .
If, in the Gershgorin circle theorem for a given ,
for all , then exactly one eigenvalue of lies in the disk .
Weisstein, Eric W. "Brauer's Theorem." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/BrauersTheorem.html