ZarankiewiczDB,

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z(15,25) = 85

By the convex optimisation bound with 15 columns of weight 3 and 10 columns of weight 4.

upper bound = 85, submitted on April 24th, 2016 (link)

By deleting 16 rows and 6 columns from the finite projective plane of order 5.

lower bound = 85, submitted on April 24th, 2016 (link)

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