Book on differential equations.

It appease that you may use the book 

ELEMENTARY DIFFERENTIAL EQUATIONS sixth edition, by EDWARDS & PENNEY 

as a replacement for

ELEMENTARY DIFFERENTIAL EQUATIONS  WITH BOUNDARY VALUES sixth edition (or seventh edition), by EDWARDS & PENNEY 

The first book could be easier to find in stock than the second one (as a paper version). 

Published Jan. 19, 2016 6:52 PM - Last modified Jan. 19, 2016 6:54 PM