Parte stabila

$$\left [\begin{array}{cc}<br />
a&2b\\<br />
b&a<br />
\end {array}\right ] \)+\left [\begin{array}{cc}<br />
c&2d\\<br />
d&c<br />
\end {array}\right ] \)=\left [\begin{array}{cc}<br />
a+c&2(b+d)\\<br />
b+d&a+c<br />
\end {array}\right ] \)$$
$$\left [\begin{array}{cc}<br />
a&2b\\<br />
b&a<br />
\end {array}\right ] \)\left [\begin{array}{cc}<br />
c&2d\\<br />
d&c<br />
\end {array}\right ] \)=\left [\begin{array}{cc}<br />
ac+2bd&2(bc+ad)\\<br />
bc+ad&ac+2bd<br />
\end {array}\right ] \)$$
$$\det AB=\det A\det B=1$$

Back to top