Claims

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2020_06_01_janzer: Janzer's bound for the r-blow-up of a long even cycle, bipartite with minimum degree 2r, lies below the problem's exponent; the site credits it with the disproof for even minimum degree at least 4; Israel J. Math. 253 (2023).

2021_09_13_janzer: Janzer's Theorem 1.4 gives, for every positive eta, a 3-regular bipartite graph with extremal number at most n to the four thirds plus eta, below the problem's exponent at minimum degree three; refereed in IMRN 2023.

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