18.*.2.3 - 19.*.2.3
Unknown macro: {latex}
$\sum_0^1 x^y$
Unknown macro: {latex}
[ \left( \begin
Unknown macro: {array}
Unknown macro: {ccc}
a & b & c
d & e & f
g & h & i \end
\right)]
is given by the formula
[ \chi(\lambda) = \left| \begin
Unknown macro: {array}
Unknown macro: {ccc}
\lambda - a & -b & -c
-d & \lambda - e & -f
-g & -h & \lambda - i \end
\right|.]