Parallelizable
A sphere 
is parallelizable if there exist 
cuts containing linearly independent tangent vectors. There existonly three parallelizable spheres: 
, 
, and 
(Adams 1962, Le Lionnais 1983).
References
Adams, J. F. ``On the Non-Existence of Elements of Hopf Invariant One.'' Bull. Amer. Math. Soc. 64, 279-282, 1958. Adams, J. F. ``On the Non-Existence of Elements of Hopf Invariant One.'' Ann. Math. 72, 20-104, 1960. Le Lionnais, F. Les nombres remarquables. Paris: Hermann, p. 49, 1983.
- Bhargava's Theorem
- Bhaskara-Brouckner Algorithm
- Bianchi Identities
- Bianchi Identities (Contracted)
- Biased
- Bias (Estimator)
- Bias (Series)
- Biaugmented Pentagonal Prism
- Biaugmented Triangular Prism
- Biaugmented Truncated Cube
- BIBD
- Bicentric Polygon
- Bicentric Quadrilateral
- Bichromatic Graph
- Bicollared
- Bi-Connected Component
- Bicorn
- Bicubic Spline
- Bicupola
- Bicuspid Curve
- Bicylinder
- Bidiakis Cube
- Bieberbach Conjecture
- Bienaymé-Chebyshev Inequality
- Bifoliate