Let's use Brother Lie's Level 4 skills as an example... um, never mind, this technique is even harder to understand. Everyone can do it, but while it's easy to learn, it's hard to master.
Let's make an analogy with Level 4 bluffs... that won't work either. A bunch of straight guys and otaku girls, I guess you're all just cute little victims of deception.
Anyway, it's a level where one could do quite well, above just being proficient.
Specifically, the mathematical knowledge stream that Han Lie is now absorbing includes—
Real analysis, harmonic analysis, complex analysis, functional analysis II, abstract algebra II, commutative algebra, group theory, representation theory of groups, introduction to Riemannian geometry, homology theory, differential topology, mathematical methods in classical mechanics, Gromov-Witten theory...
Man, Han Lie was being force-fed until he practically rolled his eyes.
