Formula_17088

\[\left.\begin{array}{l}\frac{d \gamma}{d t}=r \gamma^{\prime}-q \gamma^{\prime \prime}, \\\frac{d \gamma^{\prime}}{d t}=p \gamma^{\prime \prime}-r \gamma, \\\frac{d \gamma^{\prime \prime}}{d t}=q \gamma-p \gamma^{\prime} ;\end{array}\right\}\]