Editing Breidbart Index (section)

==Breidbart Index (BI)==
The Breidbart Index of a set of articles is defined as the sum of the square root of ''n'', where ''n'' is the number of newsgroups to which an article is [[Crossposting|cross posted]].

;Formula
<math>\mbox{BI} = \sum_{k=1}^m \sqrt{n_k}</math>

;Example
Two copies of a posting are made, one to 9 groups, and one to 16.

<math>\sqrt{9} + \sqrt{16} = 3 + 4 = 7</math>