Counterexample to an Extension of the Hanani-Tutte Theorem on the Surface of Genus 4

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Counterexample to an Extension of the Hanani-Tutte Theorem on the Surface of Genus 4

Fulek, Radoslav; Kynčl, Jan

Combinatorica (Budapest. 1981), 12/2019, Volume: 39, Issue: 6

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We find a graph of genus 5 and its drawing on the orientable surface of genus 4 with every pair of independent edges crossing an even number of times. This shows that the strong Hanani–Tutte theorem cannot be extended to the orientable surface of genus 4. As a base step in the construction we use a counterexample to an extension of the unified Hanani–Tutte theorem on the torus.

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Fulek, Radoslav | Kynčl, Jan

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