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Aug 1, 2020 at 6:12 comment added Béart @soerenssen soerenssen you are right about the strongly topological definition. But I have seen Colin de Verdière characterization of embeddings in projective plane and torus. I have not yet seen such characterization for the new invariant (just flat embeddings in ${\mathbb R}^k$)
Aug 1, 2020 at 5:59 comment added soerenssen Op-t´Bevers thank you, this is useful and in a certain sense speaks in favour of keeping with the Colin de Verdière invariant. However, what makes the new Holst Pendavingh invariant very attractive is their "strongly topological" definition with even functions, so they look like the natural generalization of Hanani-Tutte
Aug 1, 2020 at 5:57 review First posts
Aug 1, 2020 at 6:25
Aug 1, 2020 at 5:52 history answered Op-t'Bevers CC BY-SA 4.0