əbzˈɜːv ðə sˌɪmɪlˈæɹᵻɾi ʌvðə tˈuː mˈeɪtɹɪks ɹɪkˈɑːɾi dˌɪfɚɹˈɛnʃəl ᵻkwˈeɪʒənz, ðə fˈɜːst wˈʌn ɹˈʌnɪŋ fˈɔːɹwɚd ɪn tˈaɪm, ðə sˈɛkənd wˈʌn ɹˈʌnɪŋ bˈækwɚd ɪn tˈaɪm.
Observe the similarity of the two matrix Riccati differential equations, the first one running forward in time, the second one running backward in time.