Moments of the characteristic polynomial in the three ensembles of random matrices

Abstract
Moments of the characteristic polynomial of a random matrix taken from any of the three ensembles, orthogonal, unitary or symplectic, are given either as a determinant or a Pfaffian or as a sum of determinants. For Gaussian ensembles, on comparing two expressions of the same moment one obtains two remarkable identities, one between an n×n determinant and an m×m determinant and another between the Pfaffian of a 2n×2n anti-symmetric matrix and a sum of m×m determinants.

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