For example, the Fibonacci anyon system, one of the simplest, consists of labels 1 and τ τ ( τ τ denotes a Fibonacci anyon), which satisfy fusion rule τ τ × × τ τ = 1 + τ τ (corresponding to N τ τ τ τ τ τ = N τ τ τ τ 1 = 1 ) as well as the trivial rules τ τ × × 1 = τ τ and 1 × × 1 = 1 (corresponding to N τ τ 1 τ τ = N 11 1 = 1 ).