Cases

Conditions

Bounds

5th case of sparse matrix

$\left|a_0\right|+\cdots +\left|a_3\right|<1$

$\left|\lambda \right|\le 386$

Cauchy

${\Vert .\Vert }_{\infty }$

$\left|\lambda \right|\le 386$

Montel

${\Vert .\Vert }_1$

$\left|\lambda \right|\le 1023$

Carmichel-Mason

${\Vert .\Vert }_2$

$\left|\lambda \right|\le 552.981012$

Ovals of Cassini

$\gamma$ , $\delta$

$\left|\lambda \right|\le 386$

Dehmer

$M_1$ , ${\varphi }_2$

$\left|\lambda \right|\le 31.59$