from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of a proposition that is equivalent to its dual.
- adj. Of a graph or polyhedron that is the dual of itself.
Sorry, no etymologies found.
In my model, once the collapsing “late” universe is past the self-dual boundary (the critical density I referred to) and thus inside the black hole and approaching the Cauchy horizon inside, its rotation frame-drags it into a tremendously tightly wound spacetime “reel”, with each layer perhaps a Planck distance deep.
Matsuo can even derive the self-dual 3-form field strength in the M5-brane worldvolume as various objects in the 2+1-dimensional theory or their Hodge duals.
For the teacher who wishes to pursue this theorem further, it is useful to know that it is a self-dual.
Some polyhedra, such as the sphere, are self-dual.