In the present paper, we study some properties of matrices for non-structural
consequence operators. These matrices were introduced in a former work (see
[3]). In sections 1. and 2., general definitions and theorems are recalled; in
section 3. a correspondence is studied, among our matrices and Wójcicki's ones
for structural operators. In section 4. a theorem is given about operators,
induced by s... hiện toàn bộ