ABSTRACT
Explain the equation below: https://www.w3.org/1998/Math/MathML"> lh d/dt ψ → (x,t) = H ψ → (x,t) https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315833347/a609c9eb-07ad-42c9-ac54-44dbddb5af5d/content/eqn-1_C.jpg" xmlns:xlink="https://www.w3.org/1999/xlink"/>
