This lecture covers the calculation of inverse Laplace transforms using residues and introduces the Cauchy problem. The instructor explains the concept of absence of convergence, the inverse Laplace transform formula, and the Cauchy problem for ordinary differential equations. Through examples, the lecture demonstrates how to choose the appropriate parameters for solving the Cauchy problem and emphasizes the importance of verifying the obtained results. The three-step method for solving the Cauchy problem is detailed, including taking the Laplace transform, inverting the transform, and ensuring the solution meets continuity and differentiability criteria.