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- W265291222 abstract "We develop a theory of minors for alternating dimaps --- orientably embedded digraphs where, at each vertex, the incident edges (taken in the order given by the embedding) are directed alternately into, and out of, the vertex. We show that they are related by the triality relation of Tutte. They do not commute in general, though do in many circumstances, and we characterise the situations where they do. The relationship with triality is reminiscent of similar relationships for binary functions, due to the author, so we characterise those alternating dimaps which correspond to binary functions. We give a characterisation of alternating dimaps of at most a given genus, using a finite set of excluded minors. We also use the minor operations to define simple Tutte invariants for alternating dimaps and characterise them. We establish a connection with the Tutte polynomial, and pose the problem of characterising universal Tutte-like invariants for alternating dimaps based on these minor operations." @default.
- W265291222 created "2016-06-24" @default.
- W265291222 creator A5005637509 @default.
- W265291222 date "2013-11-12" @default.
- W265291222 modified "2023-10-16" @default.
- W265291222 title "Minors for alternating dimaps" @default.
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- W265291222 doi "https://doi.org/10.48550/arxiv.1311.2783" @default.
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