Elliptic Integral Singular Value k2
The second Singular Value 
, corresponding to
 | (1) |
 |  |  | (2) |
 | |  | (3) |
For this modulus,
 | (4) |
- Union
- Uniplanar Double Point
- Unipotent
- Unique
- Unique Factorization Theorem
- Unit
- Unital
- Unitary Aliquot Sequence
- Unitary Amicable Pair
- Unitary Divisor
- Unitary Group
- Unitary Matrix
- Unitary Multiperfect Number
- Unitary Multiplicative Character
- Unitary Perfect Number
- Unitary Sociable Numbers
- Unitary Transformation
- Unitary Unimodular Group
- Unit Circle
- Unit Disk
- Unit Fraction
- Unit Matrix
- Unit Point
- Unit Ring
- Unit Sphere