Variable names with more than one letter (excluding superscripts and subscripts) are awful to read and difficult to parse. Kerning issues become confusing as yo

Variable names with more than one letter (excluding superscripts and subscripts) are awful to read and difficult to parse. Kerning issues become confusing as you try to figure out where are the implied multiplications. There is nothing wrong with single letters as long as they are chosen appropriately and are clearly defined in the text.