The authors present equations for vector and axial vector mesons, showing that the square of the mass of the K_A meson minus the square of the mass of the A_1 meson equals the square of the mass of the K* meson minus the square of the mass of the rho meson. They also show that the difference between the coupling constants of the K_A and A_1 mesons equals the difference between the coupling constants of the K* and rho* mesons. They note that Eq. (14) leads to a mass of approximately 1200 MeV for the K_A meson, and that Eq. (15) is compatible with the Weinberg second sum-rule predictions for SW(2) symmetry. The authors also mention that more applications of this work will be published elsewhere. In a separate paper, Richard P. Feynman discusses the behavior of cross sections in high-energy hadron collisions. He suggests that the total cross section for very high-energy hadron collisions is composed of elastic and inelastic components, with the inelastic component being responsible for the majority of collisions producing a large number of secondaries. He proposes that the cross sections for exclusive and inclusive experiments should behave in specific ways, with exclusive experiments showing a dependence on the Regge trajectory and inclusive experiments showing a constant cross section as energy increases. He also discusses the implications of these behaviors for the distribution of particles in collisions. In another paper, D. P. Roy discusses the exchange degeneracy between N_α and N_γ contributions to pion photoproduction, which is exact for u = M² but approximate for u ≈ 0. He argues that this degeneracy can explain the absence of a dip in backward photoproduction. He also discusses the implications of gauge invariance and duality for the amplitudes of pion photoproduction, showing that the invariant amplitude A₂ is composed of contributions from N_α and N_γ trajectories. He also discusses the separation of s- and t-channel resonance contributions to the imaginary part of the u-channel Regge exchange using the duality hypothesis.The authors present equations for vector and axial vector mesons, showing that the square of the mass of the K_A meson minus the square of the mass of the A_1 meson equals the square of the mass of the K* meson minus the square of the mass of the rho meson. They also show that the difference between the coupling constants of the K_A and A_1 mesons equals the difference between the coupling constants of the K* and rho* mesons. They note that Eq. (14) leads to a mass of approximately 1200 MeV for the K_A meson, and that Eq. (15) is compatible with the Weinberg second sum-rule predictions for SW(2) symmetry. The authors also mention that more applications of this work will be published elsewhere. In a separate paper, Richard P. Feynman discusses the behavior of cross sections in high-energy hadron collisions. He suggests that the total cross section for very high-energy hadron collisions is composed of elastic and inelastic components, with the inelastic component being responsible for the majority of collisions producing a large number of secondaries. He proposes that the cross sections for exclusive and inclusive experiments should behave in specific ways, with exclusive experiments showing a dependence on the Regge trajectory and inclusive experiments showing a constant cross section as energy increases. He also discusses the implications of these behaviors for the distribution of particles in collisions. In another paper, D. P. Roy discusses the exchange degeneracy between N_α and N_γ contributions to pion photoproduction, which is exact for u = M² but approximate for u ≈ 0. He argues that this degeneracy can explain the absence of a dip in backward photoproduction. He also discusses the implications of gauge invariance and duality for the amplitudes of pion photoproduction, showing that the invariant amplitude A₂ is composed of contributions from N_α and N_γ trajectories. He also discusses the separation of s- and t-channel resonance contributions to the imaginary part of the u-channel Regge exchange using the duality hypothesis.