I understand how do 3 no. equation come from 1 & 2 no. equation. But I am struggling to understand how do 4 no. equation come from 3 no. equation. Will anyone do the steps between 3 no. equation and 4 no. equation, please ?
Quantum Field Theory in a Nutshell
Quantum field theory, Quantum field theory lectures
Quantum Numbers (Principal, Azimuthal, Magnetic and Spin
A Quantum Theory for Bose–Einstein Condensation of the Ideal Gas – Quantum
Used Book in Good Condition Highlight, take notes, and search in the book In this edition, page numbers are just like the physical edition
The Quantum Theory of Fields, Volume 1: Foundations
Quantum Field Theory, Mark Srednicki
Quantum field theory lectures How to learn quantum field theory
Klein–Gordon equation - Wikipedia
Sean Carroll – in truth, only atoms and the void
/~kcy05t/zu/qfn/eul2.gif
Quantum field simulator for dynamics in curved spacetime
Quantum Field Theory, as Simply as Possible: Zee, Anthony
An exceptionally accessible introduction to quantum field theory
Quantum Field Theory, as Simply as Possible
Quantum Field Theory: 3-4 Equation Steps Explained