Folklore conjecture on the order of regular graphs with prescribed girth

Let gg and dd be positive integers. A graph is dd-regular if every vertex has degree dd, its girth is the length of its shortest cycle, and its order is its number of vertices. Folklore conjecture. For every positive integers gg and dd, there exists a dd-regular graph GG of girth at least gg and order

Θ((d1)(12+o(1))g).\Theta\left((d-1)^{(\frac{1}{2}+o(1))g}\right).

The source describes this as a folklore conjecture related to the Moore bound and as the analogue of the preceding cubic-graph assertion for every fixed degree. The supplied status is unknown, so it remains open in this record.

Sources & referencesView supporting material

Primary source

Peter Bradshaw, Seyyed Aliasghar Hosseini, Bojan Mohar and Ladislav Stacho, “On the cop number of graphs of high girth”, arXiv:2005.10849 (2020).

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.