A new 3D autonomous dynamical system proposed by Dequan Li *(Physics
Letters A, 372, 387, 2008.)* produces a chaotic attractor whose global topological
properties are unusual. The attractor has a rotation symmetry and only a single real
fixed point for the parameters used in his study. The symmetric, complex pair of fixed
points cannot be ignored: they play a major role in organizing the motion on a surface
of peculiar toroidal type. #1

## #The algorithm

dequan-li.js`const a = 40.0; const b = 1.833; const c = 0.16; const d = 0.65; const e = 55.0; const f = 20.0; const next = (x,y,z) => { const dx = a * (y - x) + c * x * z;; const dy = e * x + f * y - x * z; const dz = b * z + x * y - d * x * x; return {dx,dy,dz}; };`