- A minusagon is a value that when added to a polygon, removes one or more sides from that polygon. Compare with a plusagon, which adds a side. Some mathematicians argue that minusagons and plusagons are the same type of object. Others argue they don’t exist.
- Seattle Black Panther Party protests gun-control bill in Olympia on February 28, 1969. (historylink.org)
On February 28, 1969, eight Black Panthers from the party’s Seattle chapter arrive in Olympia and stand on the steps of the state capitol building holding rifles and shotguns to protest a bill passed by the legislature the day before that would make it a misdemeanor to exhibit firearms or other weapons in a manner manifesting intent to intimate others. A Washington State Patrol officer asks the Panthers to unload their weapons and they do. After Seattle chapter captain Aaron Dixon (b. 1949) reads a statement to the legislature, the Panthers leave the capitol grounds and return to Seattle. The dramatic protest notwithstanding, Governor Dan Evans (1925-2024) signs the gun-control measure into law that same day.
- Digon (Wikipedia)
In geometry, a bigon, digon, or a 2-gon, is a polygon with two sides (edges) and two vertices. Its construction is degenerate in a Euclidean plane because either the two sides would coincide or one or both would have to be curved; however, it can be easily visualised in elliptic space. It may also be viewed as a representation of a graph with two vertices, see “Generalized polygon”.