Translation of handwriting into readable form

[coolul007]

Please see attached pic. I have received a handwritten document from a physicist. I am not familiar with the equations, therefore the symbols are difficult to figure out. I have done some searches. I know the first symbol is the "time second derivative" and another symbol is the "time derivative" a lot of the others I have difficulty discerning. Thanks for any help.

 

[ddd123]

That scan is too low resolution, but other than that, what exactly are you asking? Transcribe the whole thing in latex? I dont' think so. Anyway I see a lot of y's, phi's, and exp's.

 

[Nugatory]

Why would you settle for guesses when you can ask the person who sent you this?

 

[coolul007]

The person wrote it is deceased, Richard Feynman. With knowledge of the work, I assumed some would be familiar with the equations. Therefore making it simple to make them more readable.

 

[ddd123]

Why didn't you say so? Which part do you not understand?

 

[coolul007]

I don't know what character has the loop, I don't need LaTex, just the name or function

see attached

 

[ddd123]

Lowercase phi.

$\varphi_n - \varphi_{n+1}$

 

[coolul007]

Thank you