- Hurricane Ridge (Wikipedia)
Hurricane Ridge is a mountainous area in Washington’s Olympic National Park. Approximately 18 miles (29 km) by road from Port Angeles, the ridge is open to hiking, skiing, and snowboarding and is one of the two most visited sites in the national park (along with the Hoh Rainforest).
- Sequence (Wikipedia)
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.