Some Paradoxes
Here we list a few counter-intuitive results which can be proved by applying the h-principle:
- Cone Eversion. Let us consider functions f on R2 without origin f(x) = |x|. Then there is a continuous one-parameter family of functions such that, and for any, is not zero at any point.
- Any open manifold admits a (non-complete) Riemannian metric of positive (or negative) curvature.
- Smale's paradox can be done using isometric embedding of .
- Nash embedding theorem
Read more about this topic: Homotopy Principle
Famous quotes containing the word paradoxes:
“The paradoxes of today are the prejudices of tomorrow, since the most benighted and the most deplorable prejudices have had their moment of novelty when fashion lent them its fragile grace.”
—Marcel Proust (1871–1922)
“The so-called paradoxes of an author, to which a reader takes exception, often exist not in the author’s book at all, but rather in the reader’s head.”
—Friedrich Nietzsche (1844–1900)