# Is it correct to say i-th column, in the same meaning like for 5th column?

This question is also related to English, but I decided to post thread here as it may have different usage in mathematics.

In numbers, when we say the order, we say, 1st, 2nd, 3rd etc. Those "st" and "nd" changes depending on the number.

The question is what is the correct usage when I want to express the line and column in matrix. For example, i-th row and j-th column? Is is correct to use "th" in case?

• @bof I've heard both "i plus oneth" and "i plus first". I think both are acceptable. I would refer to the row indexed by $i^3$ as the "i cubed row" with no ordinal marker, simply because "i cubedth row" is a mouthful. – senshin May 5 '14 at 8:32