2. The Neutron Transport Equation# 2.1. The Continuous Neutron Transport Equation 2.2. The Multigroup Discrete Ordinates Method 2.2.1. Anisotropic Scattering 2.2.2. Fixed Source Neutron Transport Equation 2.2.3. \(k\)-Eigenvalue Neutron Transport Equation 2.3. One- and Two-Dimensional Spatial Discretization 2.3.1. One-Dimensional Slab 2.3.2. One-Dimensional Sphere 2.3.3. Two-Dimensional Slab 2.4. Temporal Discretization Schemes 2.4.1. Backward Euler 2.4.2. Crank-Nicolson 2.4.3. Second Order Backward Differentiation Formula 2.4.4. Trapezoidal Rule - Backward Differentiation Formula 2.5. Multigroup Neutron Data 2.5.1. Neutron Velocity