> [!tldr] From 0 to 1 with infinite slope A Heaviside Step Function is named after a dude. That's all I remember. It represents an instantaneous change from 0 to 1 (can be scaled as necessary, but conceptually it's 0 to 1). All I remember is that the Fourier Series for this would be infinitely large. It looks like a step. I'm not sure if that's why it's called that part. **** # More ## Source - college