Question

a series of different value​

Answer 1

Explanation:

I am trying to find a sequence xpqxpq such that ∑∞p=1∑∞q=1xpq∑p=1∞∑q=1∞xpq and ∑∞q=1∑∞p=1xpq∑q=1∞∑p=1∞xpq both exist and evaluate to different values. I am thinking of this as a matrix, but I can't seem to see how adding all the elements of it column wise vs row-wise would change the total sum? Any hints/examples would be helpful.