# Order

From Example Problems

## In mathematics

- Order (group theory), the cardinality of a group
- Order theory, a branch of mathematics that studies various kinds of binary relations known as orders
- Order (ring theory), a kind of an algebraic structure
- Orders of approximation in Big O notation
- Orders of magnitude, a class of scale or magnitude of any amount
- Order, or degree of a polynomial
- Order, or dimension of a matrix
- Order of a differential equation
- Order, in consequence to critical set cardinality in Ramsey theory
- Order in the Josephus permutation
- Weak order of permutations
- Ordered set, a permutation, bijection or cyclic order
- Un-ordered subset, or combination
- Ordered lists, or tuples and sequences
- Complete ordered field of real numbers
- Ordered pair
- List of order topics in mathematics