2002/08/31 by Andreas Kriegl, Mark Losik, Peter W. Michor
Mathematics · #math.CA #msc:26C10
published as Israel J. Math. 139 (2004), 183-188 · Amstex, 5 pages; some misprints corrected
arxiv created 2003/09/10 · arxiv updated 2009/11/30
We show that the roots of any smooth curve of polynomials with only real roots can be parametrized twice differentiably (but not better).