Differential equations mistaken as terrorist script

I am sure you heard of this interesting news about a woman thought the professor sitting next to her on a flight is scribbling terrorist script as he was working on some math (differential) equation. See here.

It is unfortunate that the actual equation being worked on is not shown on any news media... perhaps that hand handwritten math was kinda hard to read... it is perfectly fine only the guy working with it can read it... but mistaken as terrorist scripts? It must be really sloppy. Or that lady's math ability is really limited.

Ok, differential equation is no beginner stuff. That ordinary dy/dx derivative notation is already difficult for many people... You can blame Leibniz on that... perhaps f'(x) is better. The professor is probably doing some elaborate partial derivative things with that cursive d which make it more terrifying to look at.

This stuff is really beyond my math ability. I have only seen some very basic ordinary ones and yes I forgot all of it, even though I have taken a "C" or "300" level course on it. All I remember is if something fall in a certain form you can use some specific solving tricks.