Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 adjective mathematics Of a
proposition that isequivalent to its dual.  adjective mathematics Of a
graph orpolyhedron that is the dual ofitself .
Etymologies
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Examples

In my model, once the collapsing “late” universe is past the selfdual boundary (the critical density I referred to) and thus inside the black hole and approaching the Cauchy horizon inside, its rotation framedrags it into a tremendously tightly wound spacetime “reel”, with each layer perhaps a Planck distance deep.

Matsuo can even derive the selfdual 3form field strength in the M5brane worldvolume as various objects in the 2+1dimensional theory or their Hodge duals.

For the teacher who wishes to pursue this theorem further, it is useful to know that it is a selfdual.

Some polyhedra, such as the sphere, are selfdual.
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