Let be a periodic function such that . Define . Prove that is periodic and find its period.
Hi Tonio. Thank you for your reply. I am so sorry, I made an error in posting the question. The actual question in the book reads like this:
I do not understand what periodicity of a function of 2 variables means. I tried looking for the definition but I couldn't find it. Also, in your solution, I did not understand this step:
I will be very grateful if you could explain it to me. Thank you.