θ_anyon: — | Linking #: — | Tr U: —
S=k/(4π)∫A∧dA. Quasiparticles carry flux Φ=2π/k. Anyon phase θ=π/k (abelian). Wilson loop = knot invariant. k=1: integer QHE. k=2: FQHE ν=1/2.