The cumulants of a quadratic form in n independent standardized variables are identified with the traces of the powers of the matrix of the form. This identification leads to some very simple proofs ...

Sujit Kumar Mitra, P. Bhimasankaram, Some Results on Idempotent Matrices and a Matrix Equation Connected with the Distribution of Quadratic Forms, Sankhyā: The Indian Journal of Statistics, Series A ...