talrække
Talrække is a term used in Danish and Norwegian for a mathematical sequence, i.e., an ordered list of numbers (a1, a2, a3, ...) arranged according to a rule or pattern. The elements are indexed by natural numbers; a finite talrække has a last term, while an infinite talrække continues indefinitely. Each term is typically a real or complex number, and the notation a_n is used for the nth term.
Types: A talrække can be given explicitly by a formula a_n = f(n) or implicitly by a recurrence
Properties: Sequences can be monotonic (always increasing or decreasing); bounded (having an upper and/or lower bound);
Applications: Talrækker are used to describe patterns in numbers, model processes over time, analyze algorithms, and