Personally, I think the first volume is represented by Vol. I, or abbreviated as Vol. I, where volume means volume and volume. In the case of only two volumes, the first volume can be expressed as I volume (if you are not satisfied, you can add two volumes), and the corresponding next volume is II volume. In addition, Roman numerals may be more formal than Arabic numerals.

The word advanced mathematics can generally be translated into advanced mathematics or advanced mathematics.