ZarankiewiczDB,

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z(16,25) = 90

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

upper bound = 90, submitted on April 25th, 2016 (link)

By deleting 15 rows and 6 columns from the finite projective plane of order 5.

lower bound = 90, submitted on April 24th, 2016 (link)

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