Class Number Formula
A class number formula is a finite series giving exactly the Class Number of a Ring. For a Ring ofquadratic integers, the class number is denoted 
, where 
is the discriminant. A class number formula is known forthe full ring of cyclotomic integers, as well as for any subring of the cyclotomic integers. This formula includes thequadratic case as well as many cubic and higher-order rings.
- Bonne Projection
- Book Stacking Problem
- Boolean Algebra
- Boolean Connective
- Boolean Function
- Boolean Ring
- Boole's Inequality
- Borchardt-Pfaff Algorithm
- Border Square
- Bordism
- Bordism Group
- Borel-Cantelli Lemma
- Borel Determinacy Theorem
- Borel Measure
- Borel Probability Measure
- Borel Set
- Borel's Expansion
- Borel Sigma Algebra
- Borel Space
- Borromean Rings
- Borrow
- Borsuk's Conjecture
- Borwein Conjectures
- Bouligand Dimension
- Bound