Multigroup transport equations with nondiagonal cross-section matrices

Multigroup transport equations with nondiagonal cross‐section matrices are studied using the Wiener–Hopf method. Formulas for the solution and the exit distribution are given in terms of the factorization of the symbol of the Wiener–Hopf equation. Unlike the formulas for a diagonal cross‐section matrix, these formulas involve derivatives of the H‐functions. For the case of two groups, the H‐functions are computed explicitly.