- In mathematics, a sequence is an enumerated collection of objects in which repetitions are allowed and order matters. Like a set, it contains members (also called elements, or terms). The number of elements (possibly infinite) is called the length of the sequence. Unlike a set, the same elements can appear multiple times at different positions in a sequence, and unlike a set, the order does matter. Formally, a sequence can be defined as a function from natural numbers (the positions of elements in the sequence) to the elements at each position. The notion of a sequence can be generalized to an indexed family, defined as a function from an arbitrary index set.
- George H. W. Bush (allthetropes.org)
George Herbert Walker Bush (June 12, 1924 - November 30, 2018) was the 41st President of the United States. In his earlier life, he had been a World War II naval aviator (and for a time was the youngest one), completing one mission with an aircraft on fire. He also spent a year as Director of the CIA. He is the father of the other President Bush, George W. Bush.