For anyone who is confusing why u[t] = exp(At)* u[0] is showed up here, a video made by @3Blue1Brown really explains it well:Title: 'How (and why) to raise e to the power of a matrix | DE6'Link: https://www.youtube.com/watch?v=O85OWBJ2ayo&list=PLZHQObOWTQDNPOjrT6KVlfJuKtYTftqH6&index=7&ab_channel=3Blue1BrownHope this could help you out~####[['3Blue1Brown', 'Instructor', 'POS'], ['u[t] = exp(At)* u[0]', 'Mathematical_Related_Concept', 'NEU']]