CONTENTS :- 1. BOUNDARY VALUE PROBLEMS AND INTIAL VALUE PROBLEMS 2. DIFFERENTIAL EQUATIONS OF FIRST ORDER AND FIRST DEGREE 3. DIFFRENTIAL EQUATIONS OF FIRST ORDER BUTNOT OF FIRST DEGREE 4. ORTHOGONAL TRAJECTORY 5. LINEAR DIFFERENTIAL EQUATIONS WITH CONSTANT 6. ORDINARY SIMULTANEOUS DIFFRENTIAL EQUATION 7. EXACT DIFFRENTIAL EQUATION AND EQUATIONS OF SPECIAL FORMS 8. DIFFRENTIAL EQUATIONS OF SECOND ORDER WITH VARIABLE COEFFICIENTS 9. TOTAL DIFFRERNTIAL EQUATIONS 10. SERIES SOLUTION OF DIFFERENTIAL EQUATION 11. PARTIAL DIFFERENTIAL EQUATIONS OF THE FIRST ORDER 12. LINEAR PARTIAL DIFFERENTIAL EQUATIONS SECOND AND HIGHER ORDER WITH CONSTANT COEFFICIENTS