% Mizar problem: t62_fomodel0,fomodel0,3716,5 
fof(t62_fomodel0, conjecture,  (! [A] :  (! [B] :  (r1_setfam_1(A, B) => r1_setfam_1(k2_xboole_0(A, B), B)) ) ) ).
fof(commutativity_k2_xboole_0, axiom,  (! [A, B] : k2_xboole_0(A, B)=k2_xboole_0(B, A)) ).
fof(dt_k2_xboole_0, axiom, $true).
fof(idempotence_k2_xboole_0, axiom,  (! [A, B] : k2_xboole_0(A, A)=A) ).
fof(reflexivity_r1_setfam_1, axiom,  (! [A, B] : r1_setfam_1(A, A)) ).
fof(t61_fomodel0, axiom,  (! [A] :  (! [B] :  (! [C] :  (! [D] :  ( (r1_setfam_1(A, B) & r1_setfam_1(D, C))  => r1_setfam_1(k2_xboole_0(A, D), k2_xboole_0(B, C))) ) ) ) ) ).
