Multi-valued functions as single-valued on branched sheets
w = √z: two values w = ±√(r·e^(iθ/2)), branch point at z=0
A Riemann surface turns multi-valued complex functions into genuine single-valued functions
by spreading the domain over multiple sheets. Going around a branch point (monodromy) moves you from one sheet to another.
The sheets connect seamlessly along branch cuts — drag to rotate the 3D view.