[Math] Summation symbol with just one letter below it? How to verbally state.

Question

I'm used to seeing summation capital sigmas with a "start" at bottom and a "stop" at top and would say the sum from i to 100 or whatever. But in this case, there is just a y at bottom.

How would I write this out so a screen reader would be able to read it aloud and get the correct idea across to the listener?

Answer 1

I would say "sum of $f$ of $x$ and $y$ over all $y$." This is usually what is meant when no upper or lower limits are given.