Riemannian geometry was introduced by Riemann in 1854 as the n-dimensional generalization of the theory of curved surfaces of the 3D Euclidean space.

An oddity of the auto-train services, incidentally, was the occasional doubling, usually for football excursions, when the load was increased to four coaches with the engine sandwiched between.

As such, there arises a symbolic association between endonymy and the firstborn, and exonymy and the last-born, in keeping with the idea that the firstborn represents internal continuity and the last-born represents the transformation associated with exteriority. Indeed, in the practice of name-giving, the names of the firstborn come from the closest kin and from what is inside, whereas the names of the last-born come from more distant kin and from what is increasingly outside.

The MSP may eventually become part of a new spaceforce that coordinates the broad range of defensive and offensive space assets. In addition, a new emphasis is being placed upon NASA and the U.S. Air Force to coordinate activity on such a space plane/RLV development.