An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

In an → isolated system, any initial state will occur again in the course of the → evolution of the system over a sufficiently long but finite → time.

→ Poincaré sphere; → recurrence; → theorem.

1) An act or instance of recurring.
2) Return to a previous condition, habit, subject, etc. (Dictionary.com). → recurrence relation.

Verbal noun of → recur.

A → sequence based on a → rule that gives the next → term as a → function of the previous term(s). For example, the sequence 3, 9, 21, 45,... can be represented by the recurrence relation u_n+1 = 2u_n + 3, where u₁ = 3 and n ≥ 1.

→ recurrence; → relation.