The problem is rarely the math, and when it is, I can always find the explanation behind it.
It's more the notation (edit: and yes, the content aware compression) - I'm sure it's completely obvious to people who see/deal with it regularly, and I can appreciate its compactness, but unless it's a really simple one, the raw equations are just gobbledygook and often it's only after I've mapped it to some sort of pseudo-code that it starts to make sense for me and I can figure out what's going on.
It's a point of pain for me whenever I read a technical paper - almost to the point that I've toyed with the idea of building a 'math equations for programmers' site that helps deconstruct mathematical equations to programming form.