TOT 002 1980 Spring J2 S2 delete a row in NxN array of numbers
Source:
August 16, 2019
combinatoricssquare tabletable
Problem Statement
In a array of numbers, all rows are different (two rows are said to be different even if they differ only in one entry). Prove that there is a column which can be deleted in such a way that the resulting rows will still be different. (A Andjans, Riga)