A mapping problem posed (informally) in 1985
and solved 27 years later, in 2012:
See also Finite Relativity and Finite Relativity: The Triangular Version.
(A note for fans of the recent film Looper (see previous post)—
Hunter S. Thompson in this journal on February 22, 2005 …
Hunter S. Thompson, photos from The New York Times
… and on March 3, 2009.)