- Bell’s theorem (Wikipedia)
Bell’s theorem is a term encompassing a number of closely related results in physics, all of which determine that quantum mechanics is incompatible with local hidden-variable theories, given some basic assumptions about the nature of measurement. “Local” here refers to the principle of locality, the idea that a particle can only be influenced by its immediate surroundings, and that interactions mediated by physical fields cannot propagate faster than the speed of light. “Hidden variables” are supposed properties of quantum particles that are not included in quantum theory but nevertheless affect the outcome of experiments. In the words of physicist John Stewart Bell, for whom this family of results is named, “If [a hidden-variable theory] is local it will not agree with quantum mechanics, and if it agrees with quantum mechanics it will not be local.”
- Chester A. Arthur (Wikipedia)
Chester Alan Arthur (October 5, 1829[b] – November 18, 1886) was an American politician who served as the 21st president of the United States from 1881 to 1885. He was a Republican lawyer from New York who briefly served as the 20th vice president under President James A. Garfield. Arthur assumed the presidency after Garfield’s death on September 19, 1881, and served the remainder of his term until March 4, 1885.