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Jun 1, 2018 at 19:56 comment added Jürg W. Spaak Thanks, seems promising. I have however some questions: 1. There's a typo in the definition of $\mathbb{R}_0^n$, the sum should go over $x_i$. 2. I assume the usual combinations of proper functions are still proper, is this correct? 3. I only have to show, that $g$ is proper and that it's Jacobian vanishes nowhere, then the theorem is proven, correct? 4. Do you have any recommendation where I could read this up and possibly cite?
Jun 1, 2018 at 16:14 history answered Neil Strickland CC BY-SA 4.0