CONTENTS:- 1. DIFFERENTIAL EQUATIONS 2. DIFFERENTIAL EQUATION OF FIRST ORDER AND FIRST DEGREE 3. DIFFERENTIAL EQUATION OF FIRST ORDER BUT NOT OF FIRST DEGREE 4. TRAJECTORIES 5. LINEAR DIFFERENTIAL EQUATIONS 6. HOMOGENEOUS LINEAR DIFFERENTIAL EQUATIONS 7. ORDINARY SIMULTANEOUS LINEAR DIFFERENTIAL EQUATIONS 8. EXACT DIFFERENTIAL EQUATIONS 9. LINEAR DIFFERENTIAL EQUATION OF SECOND ORDER WITH VARIABLE COEFFICIENT 10. TOTAL DIFFERNTIAL EQUATIONS 11. SERIES SOLUTIONS DIFFERENTIAL EQUATIONS 12. INITIAL-VALUE AND BOUNDARY – VALUE PROBLEMS 13. PICARD’S ITERATIOVE METHOD , UNIQUENESS AND EXISTENCE THEOREMS 14. WRONSKIAN AND ITS PROPERTIES