Adjoint Equations and Perturbation Algorithms in Nonlinear Problems

Principles for constructing adjoint operators in nonlinear problems

Properties of adjoint operators and solvability conditions for adjoint equations

Perturbation algorithms using the adjoint equations theory for nonlinear problems in transport theory, quasilinear motion, substance transfer, and nonlinear data assimilation

Known results on adjoint equations and perturbation algorithms in nonlinear problems