Short Proofs of Khintchine-Type Inequalities for Zero-One Matrices

Abstract If an n × n matrix has entries either zero or one, row sums ri and column sums sj, the ∑r i 2 + ∑s j 2 ⩽ h(n + h n ) Khintchine, Mat. Sb. 39 (1932) , 35–39) and ∑ri2 + ∑sj2 ⩽ nh + ∑risi (Matus, Report 1652, UTIA CSAV (1990)) , where h is the number of ones. Extensions of the inequalities are presented and proved by elementary means.