2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/57497The mean-field reaction-diffusion equations of the diffusive pair-annihilation and triplett-annihilation processes are considered. A direct lower bound on the time-dependent mean particle-density is derived. The results are applied to the mean-field theory of the diffusive pair-contact process.Latex2e, 9 pagesMathematical PhysicsStatistical MechanicsHigh Energy Physics - TheoryAnalysis of PDEsOn lower bounds of the solutions of some simple reaction-diffusion equationstext