plural of de Bruijn index

(sociology) A measure of material deprivation within a population, based on four variables: unemployment, non-car ownership, non-home ownership, and household overcrowding.

(differential geometry) A theorem stating that, for an elliptic differential operator on a compact manifold, the analytical index (related to the dimension of the space of solutions) is equal to the topological index (defined in terms of some topological data).

A catalogue of traditional tales based around motifs used in folklore studies.

plural of ease of doing business index

(economics) An index created by the World Bank, where higher rankings indicate better, usually simpler regulations for businesses and stronger protections of property rights.