This lecture introduces essential mathematical concepts for 3rd year Bachelor physics courses, focusing on solving Ordinary and Partial Differential Equations (ODEs and PDEs) encountered in physics. Topics include wave equations, linear algebra applications, special functions, Fourier analysis, and PDE resolution methods. The course emphasizes practical problem-solving skills and provides exercises for hands-on practice. The format includes lectures, exercises, and a main reference book. The instructors encourage active participation and offer support through pre-recorded videos, live Q&A sessions, and a collaborative Slack workspace.