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1. I Lewis H Ryder page 61, coordinate transformations

Oh you are absolutely righ, I overthinked that haha and yes i can complete the last step ^^ thanks for your help I appreciate it
2. I Lewis H Ryder page 61, coordinate transformations

The example is about the transformation between the cartesian coordinates and polar coordinates using the definition In lewis Ryder's solution, I got confused in this specific line I really can't see how is that straightforward to find?
3. A Dirac Propagator

I tried to apply the derivative again and I got the answer now. thank you all and sorry for the messed up thread.
4. Mathematica How to solve this differential equation using Mathematica's Dsolve?

Thank you sir
5. A Dirac Propagator

sorry, I just read the rules here, I'm kinda new it won't happen again.
6. A Dirac Propagator

I did apply the derivative of time only, can u put more details please?
7. Mathematica How to solve this differential equation using Mathematica's Dsolve?

thats what i got
8. Mathematica How to solve this differential equation using Mathematica's Dsolve?

here's my best try
9. Mathematica How to solve this differential equation using Mathematica's Dsolve?

I'm actually so beginner in Mathematica, just want to know how to put the code in , idk what i did or what went wrong but i want to know the right way to it ù-ù

11. A Dirac Propagator

wanna know how to get to 8.2
12. Free Klein Gordon

Homework Statement i need a detailed solution for Classical field Klein gordon equation please , i just stop when the delta function get evolved in Homework Equations The Attempt at a Solution