New oscillation criteria for second-order neutral delay differential equations with positive and negative coefficients.
New oscillation criteria for second-order delay differential equations with mixed nonlinearities.
Backward solutions to nonlinear integro-differential systems
In this paper, we show the backward uniqueness in time of solutions to nonlinear integro-differential systems with Neumann or Dirichlet boundary conditions. We also discuss reasonable physical interpretations for our conclusions.
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