Lead sentence In this earlier version of the article I can actually understand what a perfect number is simply by reading the first sentence In later revisions one is confronted by an equation instead of plain English That might be fine if the article were written for mathematicians or even just people who are comfortable with equations but there are the to be considered The topic is far enough outside my comfort zone that I m not going to be bold and change it myself but I m proposing that the lead sentence should not rely on symbols variables or numerals to comprise a complete sentence