% Mizar problem: t18_orders_1,orders_1,369,2 
fof(t18_orders_1, conjecture,  (! [A] :  (v1_relat_1(A) =>  (v3_orders_1(A) => v3_orders_1(k2_relat_1(A))) ) ) ).
fof(involutiveness_k2_relat_1, axiom,  (! [A] :  (v1_relat_1(A) => k2_relat_1(k2_relat_1(A))=A) ) ).
fof(dt_k2_relat_1, axiom,  (! [A] :  (v1_relat_1(A) => v1_relat_1(k2_relat_1(A))) ) ).
fof(l28_orders_1, axiom,  (! [A] :  (v1_relat_1(A) =>  (v6_relat_2(A) => v6_relat_2(k2_relat_1(A))) ) ) ).
