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Ascending, Bridge, and Unknotting Numbers of Knotted Graphs
Bahar Acu, Puttipong Pongtanapaisan, Ritikaa Singhal
Source abstract
In this paper we define the ascending number and bridge number for virtual and welded spatial graphs. We prove that the former admits a lower bound in terms of the latter. This relationship allows us to compare different notions of unknotting virtual spatial graphs by crossing changes.
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