- Yars’ Revenge is a video game developed and published by Atari for the Atari 2600 in 1982. It was designed by Howard Scott Warshaw, who also created the infamous E.T. the Extra-Terrestrial game for the same platform. Yars’ Revenge quickly became Atari’s best-selling original title for the 2600 and is considered one of the console’s classic games.
- Empty set (Wikipedia)
In mathematics, the empty set is the unique set having no elements; its size or cardinality (count of elements in a set) is zero. Some axiomatic set theories ensure that the empty set exists by including an axiom of empty set, while in other theories, its existence can be deduced. Many possible properties of sets are vacuously true for the empty set.
