On 03/22/13 11:46, Jaime Villate wrote:
> Can you tell me the reference for the book you are using; I'm very
> interested in this subject
>
It is an old book.
Elementary Differential Equations,
Earl D. Rainville and Phillip E. Bedient,
Fourth Edition,
Copyright, The Macmillian Company, 1969
ISBN 69-10274
The third edition was printed in 1970. Does not give the date of the
fourth printing.
Tom Dean