Monotone Simultaneous Embeddings of Paths in R^d
  We study the following problem: Given $k$ paths that share the same vertex set, is there a simultaneous geometric embedding of these paths such that each individual drawing is monotone in some direction? We prove that for any dimension $d \geq 2$, there is a set of $d+1$ paths that does not admit a monotone simultaneous geometric embedding. 
David Bremner and Olivier Devillers and Marc Glisse and Sylvain Lazard   and Giuseppe Liotta and Tamara Mchedlidze and Sue W...
cs.CG cs.DS