hypergeometric series
where (a)n = a(a + 1)(a + 2)⋯(a + n−1) for n ≥ 1 and (a)0 = 1.
- unique factorization domain
- unit
- unit
- unitary matrix
- unitary ratio
- unit circle
- unit cube
- unit matrix
- unit square
- unit vector
- unity
- univalent
- universal covering space
- universal gravitational constant
- universal machine
- universal quantifier
- universal set
- unknot
- unknown
- unstable equilibrium
- upper bound
- upper limit
- upper triangular matrix
- Urysohn's lemma
- utility