There are three classical attractors, a point which characterises a steady state system, a closed loop which characterises a periodic system, and a torus which combines several cycles.
In some cases, astronomers can look along the axis of the dust torus from above or from below and have a clear view of the black hole.
Into how many pieces can one cut a torus using two planes?
To avoid edge effects, the lattice is represented on a circle for a one-dimensional model or a torus for a two-dimensional model.
The surface of a sphere is a good example, as is a torus (the mathematical name for the shape of the surface of a quoit, or a ring-shaped doughnut).
One stand has a torus molding with red-painted triglyph and metopal sections, while a lower register has alternating black and white sections.
The Clifford torus is generated by a family of circles.
A torus , or ‘buckle,’ fracture of the distal radius is a common type of fracture in children.
Cassini will cross the torus of dust in Enceladus' orbit and must turn to a protective attitude.
The surface area of the inside portion of a torus can be obtained by integrating Eq. 4, which yields