OP-01032 Partially resolved Large subsets of [N] with no solution of x + 3y = 2z + 2w in distinct integers NT · linear equations in sets · Ruzsa's problem · solution-free sets
OP-01033 Partially resolved The largest number of affine copies of {0, 1, 3} in a set of n integers CO · affine copies · extremal combinatorics · linear equations in sets