- Alioth (stars.astro.illinois.edu)
ALIOTH (Epsilon Ursae Majoris). The graceful curve of handle of the Big Dipper (the Plough in Great Britain), among the most famed of celestial sights, represents the tail of Ursa Major, the Greater Bear. Third star in from the end, “Alioth” relates not to a bear, but to a “black horse,” the name corrupted from the original and misassigned to the naked-eye companion of Mizar, which took on the vaguely similar name “Alcor.”
- Real number (Wikipedia)
In mathematics, a real number is a number that can be used to measure a continuous one-dimensional quantity such as a distance, duration or temperature. Here, continuous means that pairs of values can have arbitrarily small differences. Every real number can be almost uniquely represented by an infinite decimal expansion.