Faro Shuffle (in-shuffle)
Doing in-shuffles on a deck of n cards.
Doing in-shuffles on a deck of n cards.
Doing out-shuffles on a deck of n cards.
Cutting three dimensional shapes and looking at the possible shapes of the cross section.
Each regular polygram has a regular polygon at its center.
Cutting 3D shapes parallel to the base such that the top and bottom resulting portions have the same volume.