Hecke algebra of a pair
In mathematical representation theory, the Hecke algebra of a pair is an algebra with an approximate identity, whose approximately unital modules are the same as K-finite representations of the pairs. Here K is a compact subgroup of a Lie group with Lie algebra g.Definition
The Hecke algebra of a pair is the algebra of K-finite distributions on G with support in K, with the product given by convolution.