Willie Wong
A mathematician specializing in nonlinear hyperbolic PDEs, geometric analysis of pseudoRiemannian manifolds, and general relativity.
A few of my questions on MO have not yet received a complete answer. Some of them I think about in the course of my research. But this one is entirely orthogonal to my main research activity and I would love to know the answer!
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 417 Does there exist a bijection of $\mathbb{R}^n$ with itself such that the forward map is connected but the inverse is not?
 245 Open problems in General Relativity
 134 What's the best way to write email addresses?
 134 Does there exist a bijection of $\mathbb{R}^n$ to itself such that the forward map is connected but the inverse is not?
 113 Mathematical precise definition of a PDE being elliptic, parabolic or hyperbolic
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