This lecture covers the principles of mathematical induction, including the basis step and inductive step, as well as the validity and correctness of the method. It also explores applications of mathematical induction in proving inequalities, divisibility results, and the number of subsets in a finite set. Additionally, the lecture delves into strong induction and its use in proving propositions for all positive integers. The session concludes with examples showcasing the application of strong induction in proving statements about integers and sets.