In his research, conducted between 1864 and 1873, Maxwell showed that a few relatively simple mathematical equations could express the behavior of electric and magnetic fields and their interrelated nature; that is, an oscillating electric charge produces an electromagnetic field. (phy.pmf.unizg.hr)
I kept returning to the idea that the of the work of the Foundation is actually a very simple mathematical equation: one artist = many artists. (joanmitchellfoundation.org)
While there's no exact science when it comes to how much a newborn should eat, there is a simple mathematical equation to get a rough estimate of how many ounces your baby needs each day. (verywellfamily.com)