A class number formula expresses the class number of a number field, or of an order in a number
field, in terms of other invariants. For a quadratic
field, the class number is denoted 
, where 
is its discriminant, and
explicit formulas involve Dirichlet L-series.
Class Number Formula
See also
Class Number, RingExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Class Number Formula." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/ClassNumberFormula.html