> needed a Bessel function at one point in my career. Could I write down its form from having seen it at uni? No, of course not. Did I spend time doing just tha

> needed a Bessel function at one point in my career. Could I write down its form from having seen it at uni? No, of course not. Did I spend time doing just that at uni? Yes. From someone without formal education: you knew about the concept and what to search for. I have to waste a lot of time every time digging for this.