Hadamard regularization

In mathematics, Hadamard regularization (also called Hadamard finite part or Hadamard's partie finie) is a method of regularizing divergent integrals by dropping some divergent terms and keeping the finite part, introduced by Jacques Hadamard (1923, book III, chapter I, 1932). Marcel Riesz (1938, 1949) showed that this can be interpreted as taking the meromorphic continuation of a convergent integral.