I'm fairly new to this topic. I have not yet studied the first topics in the Differential Equation but I decided to study this first. I don't know why. But I do hope you'll help me understand this. Problem: Suppose that f(x) has period 2 and that f(x) = 0 ; -1 ≤ x ≤ 0 = 1 ; 0 < x < 1 What is the value of L in that? In the video it says it's 1. But how come 1 is the value of L? What is L? L is from the equation Thank you very much and I do hope you can help me.