This book presents some recent mathematical developments about neutron transport equations. Several different topics are dealt with including regularity of velocity averages, spectral analysis of transport operators, inverse problems, nonlinear problems arising in the stochastic theory of neutron chain fissions, compactness properties of perturbed of c₀-semigroups in Banach spaces with applications to transport theory, Miyadera perturbations of c₀-semigroups in Banach spaces with applications to singular transport equations, a thorough analysis of the leading...