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λ=(1±√-39)λ=(0±√-28)λ=(-1±√-39)λ=(1±√0.0)λ=(-1±√0.0)λ=(1±√21)λ=(-5±√9)λ=(-6±√36)λ=(6±√36)Wxx+Wyy<2Wxy, Δ≠0, τ>0 unstable spiral + limit cycleWxx+Wyy<2Wxy, Δ≠0, τ=0 closed orbits + limit cycleWxx+Wyy<2Wxy, Δ≠0, τ<0 stable spiralWxx+Wyy=2Wxy, Δ≠0, τ>0 unstable starWxx+Wyy=2Wxy, Δ≠0, τ<0 stable starWxx+Wyy>2Wxy, Δ<0 saddle node+boundary nodeWxx+Wyy>2Wxy, Δ>0, τ<0 stable nodeΔ=0, no isolated fixed point line attractorΔ=0, no isolated fixed point line repeller