2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/156582We obtain using exponential quadratic sums, explicit expressions for the number of triple persymmetric matrices over F_2 of given rank. (A matrix [a(i,j)] is persymmetric if a(i,j) = a(r,s) for i+j = r+s)233 pagesNumber Theory11 T 23, 15 A 33text