ZarankiewiczDB,

an online database of Zarankiewicz numbers. home; recent; tables; submit; theorems & references

z(21,26) = 116

By the density principle on z(20,26).

upper bound = 116, submitted on April 28th, 2016 (link)

By deleting 10 rows and 5 columns from the finite projective plane of order 5.

lower bound = 116, submitted on April 28th, 2016 (link)

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