Not being able to keep a complex math problem in ones head would be a memory problem as well, would it not... before my age 34 diagnosis - forget math all together... my working memory was abysmal; now I am completing 2nd year IT: ComSci. I have a chance, thanks to that "demon" stimulant medication, and a environment, where I am not told I am "lazy" any more. This article, while seemingly accurate, leaves out the obvious rare case of actual ADHD.