Change of plan

Since I am still in the planning phase I can change the plan whenever I think the overall sitiatopm nemefirs

I changed my mind on the books I will use next to the MST209 materials. If I don't understand something in book A I have a look how it is explained in book B. Comparing books also helps in determining what's really important. I am not ready yet for 'Kelley, Peterson' so I am going to drop their book.

- Elementary Differential Equations Sixth Edition C. Henry Edwards David E. Penney ( Used in MIT 18.03 )
- J. David Logan A First Course in Differential Equations ( Springer book, formal at the undergraduate level )
- Differential Equations with Mathematica Third Edition Martha L. Abell James P. Braselton ( Very practical with tons of do-able exercises in Mathematica )
- Differential Equations Demystified Steven G. Krantz ( Lots of Recipes, Exercises and Solutions )

All in all a balanced set of books to complement the core MST209 materials, I suppose.