Quenya (pronounced [ˈkwɛnja]) is a fictional language devised by J. R. R. Tolkien, and used by the Elves in his legendarium. Tolkien began devising the language at around 1910 and re-structured the grammar several times until Quenya reached its final state. The vocabulary remained relatively stable throughout the creation process. Also the name of the language was repeatedly changed by Tolkien from Elfin and Qenya to the eventual Quenya. The Finnish language had been a major source of inspiration, but Tolkien was also familiar with Latin, Greek and ancient Germanic languages when he began c...

In mathematics, if a function is injective, exactly one function will exist such that , otherwise no such function will exist. The function is called the inverse function of because it "reverses" ; that is to say . == Definitions == Let f be a function whose domain is the set X, and whose image (range) is the set Y. Then f is invertible if there exists a function g with domain Y and image X, with the property: If f is invertible, the function g is unique, which means that there is exactly one function g satisfying this property (no more, no less). That function g is then called the inverse...

In physics, the Bekenstein bound is an upper limit on the entropy S, or information I, that can be contained within a given finite region of space which has a finite amount of energy—or conversely, the maximum amount of information required to perfectly describe a given physical system down to the quantum level. It implies that the information of a physical system, or the information necessary to perfectly describe that system, must be finite if the region of space and the energy is finite. In computer science, this implies that there is a maximum information-processing rate (Bremermann's limit...