- In mathematics, the axiom of choice, abbreviated AC or AoC, is an axiom of set theory equivalent to the statement that a Cartesian product of a collection of non-empty sets is non-empty. Informally put, the axiom of choice says that given any collection of sets, each containing at least one element, it is possible to construct a new set by choosing one element from each set, even if the collection is infinite.
- Queens (Wikipedia)
Queens is the largest by area of the five boroughs of New York City, coextensive with Queens County, in the U.S. state of New York. Located near the western end of Long Island, it is bordered by the borough of Brooklyn and by Nassau County to its east, and shares maritime borders with the boroughs of Manhattan, the Bronx, and Staten Island, as well as with New Jersey. Queens is the most linguistically and ethnically diverse place in the world.