Lectures: Field of real and complex numbers. Metric space. Sequences (convergence of asequence, real and complex sequences, complete metric space). Number series. Limits, continuity and uniform continuity of functions. Real functions of a real variable (limit, continuity, uniform continuity, differential calculus and application, indefinite integral, definite integral and application, improper integral). Real functions of several real variables (limits, continuity, uniform continuity, differential calculus and application). Ordinary differential equations of the first and the higher order. Linear differential equations of order n. Numerical series. Exercises: Corresponding examples from theoretical lectures are done in exercises, thus practicing the taught lectures and understanding them better.