CONTENTS :- PART - A 1. DIFFERENTIAL EQUATION OF FIRST ORDER AND FIRST DEGREE, 2. DIFFERENTIAL EQUATION OF FIRST ORDER BUT NOT OF FIRST DEGREE, 3. TRAJECTORIES, 4. LINERA DIFFERENTIAL EQUATIONS WITH CONSTANT COEFFICIENTS, 5. HOMOGENEOUS LINEAR DIFFERENTIAL EQUATIONS, 6. ORDINARY SIMULTANEOUS LINEAR DIFFERENTIAL EQUATIONS, 7. EXACT DIFFERENTIAL EQUATIONS, 8. LINEAR DIFFERENTIAL EQUATIONS OF SECOND ORDER WITH VARIBALE COEFFICIENTS, 9. TOTAL DIFFERENTIAL EQUATIONS, 10. SERIES SOLUTIONS OF SECOND ORDER DIFFERENTIAL EQUATIONS, 11. AN INTRODUCTIONS TO PARTIAL DIFFERENTIAL EQUATIONS, 12. SOME METHODS FOR THE SOLUTION OF PARTIAL DIFFERENTIAL EQUATIONS, 13. PARTIAL DIFFERENTIAL EQUATIONS OF SECOND ORDER, 14. PARTIAL DIFFERENTIAL EQUATIONS WITH CONSTANT COEFFICIENTS, PART - B 1. SEQUENCES, 2. INFINITE SERIES