Note on: N.E. Aguilera, M.S. Escalante, G.L. Nasini, “The disjunctive procedure and blocker duality”

Motivated by the work of Gerards et al. [Math. Oper. Res. 28 (2003) 884-885] we propose a simpler proof of (B) as well as an alternative proof of (A), independent of (B). Both of them are based on the relationship between the “disjunctive relaxations” obtained by P¯j and the set covering polyhedra associated with some particular minors of C.