クープマンモデル
{ A ( t ) = 1 2 { ( A 0 − a b B 0 ) e a b t + ( A 0 + a b B 0 ) e − a b t } B ( t ) = 1 2 { − ( b a A 0 − B 0 ) e a b t + ( b a A 0 + B 0 ) e − a b t } {\displaystyle {\begin{cases}A(t)={\frac {1}{2}}\{\left(A_{0}-{\sqrt {\frac {a}{b}}}B_{0}\right)e^{{\sqrt {ab}}t}+\left(A_{0}+{\sqrt {\frac {a}{b}}}B_{0}\right)e^{-{\sqrt {ab}}t}\}\\B(t)={\frac {1}{2}}\{-\left({\sqrt {\frac {b}{a}}}A_{0}-B_{0}\right)e^{{\sqrt {ab}}t}+\left({\sqrt {\frac {b}{a}}}A_{0}+B_{0}\right)e^{-{\sqrt {ab}}t}\}\end{cases}}}