メモ
where x and y are the annual expenditures on "defense" of opposing groups,then
dx/dt=g-ax+ky, dy/dt=h+lx-by,
in which g, h, a, b, k, and l are constants and t is the time.
The phrase "normal co-ordinates" will be used to denote any linear function of the given variables x and y with coefficients so chosen that only a single exponential function of time is involved.
リチャードソンの使っている数学は至極易しい（Mさんも安心）
「舞-HiME」「舞-乙HiME」スタッフは、視聴者サービスをやめたら死ぬ奇病にかかっている
dx/dt=g-ax+ky, dy/dt=h+lx-by,
in which g, h, a, b, k, and l are constants and t is the time.
The phrase "normal co-ordinates" will be used to denote any linear function of the given variables x and y with coefficients so chosen that only a single exponential function of time is involved.
リチャードソンの使っている数学は至極易しい（Mさんも安心）
「舞-HiME」「舞-乙HiME」スタッフは、視聴者サービスをやめたら死ぬ奇病にかかっている