Class number
Encyclopedia
In mathematics, class number may refer to
- Class number (group theory), the number of conjugacy classes of a group
- The size of the ideal class groupIdeal class groupIn mathematics, the extent to which unique factorization fails in the ring of integers of an algebraic number field can be described by a certain group known as an ideal class group...
of a number ring - The number of equivalence classes of binary quadratic formBinary quadratic formIn mathematics, a binary quadratic form is a quadratic form in two variables. More concretely, it is a homogeneous polynomial of degree 2 in two variableswhere a, b, c are the coefficients...
s of a given discriminant