Sentence examples for i refer from inspiring English sources

What does the term "I" refer to there?

Let the subscript i refer to individual i.

I refer to this as "studying".

I refer you to them.

"I refer to the balloon," Andrée said.

I refer, of course, to novelists.

I refer to her as his partner.

Should I refer the issue up?

I refer to the three-martini lunch.

I refer to "the Emperor's [New] Clothes".

Note that i refers to i-th row vector here.