 reserve T for Ternary_Boolean_Algebra;
 reserve a,b,c,d,e for Element of T;
 reserve x,y,z for Element of T;
reserve T for Ternary_Boolean_Algebra;
reserve x for Element of T;
reserve B for Boolean Lattice;
reserve v0,v1,v2,v3,v4,v5,v6,v103,v100,v102,v104,v105,v101 for
  Element of BA2TBAA B;

theorem
for B being Boolean Lattice
  for v0,v1 being Element of BA2TBAA B,
      a,b being Element of B st a = v0 & b = v1 holds
    v0 "\/" v1  = a "\/" b;
