1. Linear equations. Basic notions. - 2. Equations with a Closed Operator. - 3. The Adjoint Equation. - 4. The Equation Adjoint to the Factored Equation. - 5. An Equation with a Closed Operator Which Has a Dense Domain. - 6. Normally Solvable Equations with Finite Dimensional Kernel. - 7. A Priori Estimates. - 8. Equations with Finite Defect. - 9. Some Different Adjoint Equations. - 10. Linear Transformations of Equations. - 11. Transformations of d-Normal Equations. - 12. Noetherian equations. Index. - 13. Equations with Operators Which Act in a Single Space. - 14. Fredholm equations. Regularization of equations. - 15. Linear Changes of Variable. - 16. Stability of the Properties of an Equation. - 17. Overdetermined Equations. - 18. Undetermined Equations. - 19. Integral Equations. - 20. Differential Equations. - Appendix. Basic results from functional analysis used in the text. - Literature cited. Language: English