Cauchy problem for first order partial differential equations
§ 37. Comparison theorems for systems of partial differential inequalities § 38. Comparison theorems for overdetermined systems of partial differential inequalities § 39. Estimates of the solution § 40. Estimate of the existence domain of the solution § 41. Estimates of the difference between two solutions § 42. Uniqueness criteria § 43. Continuous dependence of the solution on initial data and on right-hand sides of system § 44. Estimate of the error of an approximate solution § 45. Systems with total differentials