Sievert's Surface
A special case of Enneper's Negative Curvature Surfaces which can be given parametrically by
 |  |  | (1) |
 | |  | (2) |
 | |  | (3) |
where
 |  |  | (4) |
 | |  | (5) |
 | |  | (6) |
with
and 
(Reckziegel 1986).See also Enneper's Negative Curvature Surfaces, Kuen Surface, Rembs' Surfaces
References
Fischer, G. (Ed.). Plate 87 in Mathematische Modelle/Mathematical Models, Bildband/Photograph Volume. Braunschweig, Germany: Vieweg, p. 83, 1986. Reckziegel, H. ``Sievert's Surface.'' §3.4.4.3 in Mathematical Models from the Collections of Universities and Museums (Ed. G. Fischer). Braunschweig, Germany: Vieweg, pp. 38-39, 1986. Sievert, H. Über die Zentralflächen der Enneperschen Flachen konstanten Krümmungsmaßes. Dissertation, Tübingen, 1886.
- Unit Point
- Unit Ring
- Unit Sphere
- Unit Square
- Unit Step
- Unit Vector
- Unity
- Univalent Function
- Univariate Function
- Univariate Polynomial
- Universal Graph
- Universal Statement
- Universal Turing Machine
- Unknot
- Unknotting Number
- Unless
- Unlesss
- Unmixed
- Unpoke Move
- Unsafe
- Unsolved Problem
- Unstable Improper Node
- Unstable Node
- Unstable Spiral Point
- Unstable Star