Figure 2.

Singular orbit. Sections of infinitely long cylindrical surfaces that are orbits under a cylindrical action (rotations and translations). The axis of rotation (black line) forms a singular orbit because all the rotations map the points of the axis to themselves.

Raumonen et al. Boundary Value Problems 2011 2011:9   doi:10.1186/1687-2770-2011-9
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