wiː kæn ˈiːzili sˈiː ðə kˌɔːɹɪspˈɑːndəns bᵻtwˌiːn dɪskɹˈiːt tˈaɪm ænd ðə kəntˈɪnjuːəs tˈaɪm kˈeɪs, ðæt ˈɪz, ɪf wiː kæn tʃˈɛk ðæt ɪz pˈɑːzᵻtˌɪv dˈɛfɪnət, ænd ˈɔːl ˈaɪdʒənvˌæljuːz ʌv hæv mˈæɡnɪtˌuːd lˈɛs ðɐn , ðə sˈɪstəm ɪz kəntɹˈoʊləbəl.
We can easily see the correspondence between discrete time and the continuous time case, that is, if we can check that  is positive definite, and all eigenvalues of  have magnitude less than , the system  is controllable.