00100 LE(X1 X2) ↔ R(D(X1 X2)O) ; 00200 LE(D(X1 X2) X1); 00300 LE( D(D(X1 X3) D(X2 X3)) D(D(X1 X2) X3) ); 00400 LE(O X1); 00500 R(X1 X1); 00600 (LE(X1 X2) ∧ LE(X2 X1)) → R(X1 X2); 00700 ; 00800 00900 R(D(X1 X1) O); 01000 ∀(X1 X2 X3)( LE( X1 X2) ∧ LE( X2 X3)) → LE( X1 X3); 01100 ∀(X1)R(D(X1 O) X1) ; ; 01200 ∀(X1 X2 X3)(LE(X1 X2) → LE(D(X3 X2) D(X3 X1)));; 01250 01300 01500 01600 01700