ZarankiewiczDB,

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z(15,17) = 67

R. K. Guy [Guy69] gave an incorrect value of 66.

submitted by Andrew Kay on April 22nd, 2016 (link)

By the density principle on z(14,17).

upper bound = 67, submitted on April 22nd, 2016 (link)

By deleting 6 rows and 4 columns from the finite projective plane of order 4.

lower bound = 67, submitted on April 22nd, 2016 (link)

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