Poincaré Formula
The Polyhedral Formula generalized to a surface of Genus 
.
where
is the number of Vertices, 
is the number of Edges,
is the number of faces, and
is called the Euler Characteristic.See also Euler Characteristic, Genus (Surface), Polyhedral Formula
References
Eppstein, D. ``Fourteen Proofs of Euler's Formula: 
.'' http://www.ics.uci.edu/~eppstein/junkyard/euler/.
- Broyden's Method
- Bruck-Ryser-Chowla Theorem
- Bruck-Ryser Theorem
- Brunnian Link
- Brunn-Minkowski Inequality
- Brun's Constant
- Brun's Sum
- Brun's Theorem
- Brute Force Factorization
- B-Spline
- B-Tree
- Bubble
- Buchberger's Algorithm
- Buckminster Fuller Dome
- Buffon-Laplace Needle Problem
- Buffon's Needle Problem
- Bulirsch-Stoer Algorithm
- Bullet Nose
- Bumping Algorithm
- Bundle
- Burau Representation
- Burkhardt Quartic
- Burnside Problem
- Burnside's Conjecture
- Burnside's Lemma