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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 425 Does there exist a bijection of $\mathbb{R}^n$ with itself such that the forward map is connected but the inverse is not?
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 135 Does there exist a bijection of $\mathbb{R}^n$ to itself such that the forward map is connected but the inverse is not?
 114 Mathematical precise definition of a PDE being elliptic, parabolic or hyperbolic
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