Die in der Kapitelüberschrift genannten Systeme haben die Gestalt
$$
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\begin{array}{*{20}c}
{u_1 = a_{11} (t)u_1 + \cdots + a_{1n} (t)u_n + s_1 (t)} \\
\vdots \\
{u_n = a_{n1} (t)u_1 + \cdots + a_{nn} (t)u_n + s_n (t)} \\
\end{array}
$$
(56.1)
mit reellwertigen a
jk
(t) und s
j
(t).Setzen wir
$$
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A\left( t \right): = \left( {\begin{array}{*{20}c}
{a_{11} \left( t \right)} & \ldots & {a_{1n} \left( t \right)} \\
\vdots & t & t \\
{a_{n1} \left( t \right)} & \ldots & {a_{nn} \left( t \right)} \\
\end{array} } \right),u\left( t \right): = \left( {\begin{array}{*{20}c}
{u_1 \left( t \right)} \\
\vdots \\
{u_n \left( t \right)} \\
\end{array} } \right),s\left( t \right): = \left( {\begin{array}{*{20}c}
{s_1 \left( t \right)} \\
\vdots \\
{s_n \left( t \right)} \\
\end{array} } \right)
$$
so läßt sich (56.1) in der kompakten Form
$$
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\dot u = A\left( t \right)u + s\left( t \right)
$$
(56.2)
schreiben. Und nun gilt der grundlegende.