Divisible subdivisions

We prove that for every graph H of maximum degree at most 3 and for every positive integer q there is a finite f = f ( H , q ) such that every K f‐minor contains a subdivision of H in which every edge is replaced by a path whose length is divisible by q. For the case of cycles we show that for f = O...

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Veröffentlicht in:Journal of graph theory 2021-12, Vol.98 (4), p.623-629
Hauptverfasser: Alon, Noga, Krivelevich, Michael
Format: Artikel
Sprache:eng
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Zusammenfassung:We prove that for every graph H of maximum degree at most 3 and for every positive integer q there is a finite f = f ( H , q ) such that every K f‐minor contains a subdivision of H in which every edge is replaced by a path whose length is divisible by q. For the case of cycles we show that for f = O ( q log q ) every K f‐minor contains a cycle of length divisible by q, and observe that this settles a recent problem of Friedman and the second author about cycles in (weakly) expanding graphs.
ISSN:0364-9024
1097-0118
DOI:10.1002/jgt.22716