By - Hudakh
Sure, why not?
Yes, but make sure to fix the dimensions of your solution afterwards using dimensional analysis.
Physicists frequently put c = hbar = 1 to simplify their math.
It actually appears in this form on the Wikipedia page for the Dirac equation, do Ctrl+F for "Dirac equation(natural units)" (I'm assuming you are using h to mean h-bar). Note that the curly d with the line through it is called Feynman slash notation and it means gamma\^mu curly d\_mu.
Thank you very much