I'm looking for two books:
1) a sophisticated, but high school level Euclidean Geometry book. I've got some bright younger students, and I'd like to get them thinking about more interesting geometry problems than are covered in typical modern American public high schools.
2) For myself, I'd like to find a book that presents dynamical systems (i.e. non-linear diff. eq.s) from a differential forms perspective, and with a fair degree of geometry, less abstract formal manipulations and more geometric intuition. Ideally it would also connect to, hint at, or even outright discuss, algebraic topology, i.e. cohomology...
Any ideas?
Any ideas?