% Mizar problem: t59_classes1,classes1,1670,32 
fof(t59_classes1, conjecture,  (! [A] : k5_classes1(k5_classes1(A))=k5_classes1(A)) ).
fof(dt_k5_classes1, axiom, $true).
fof(fc3_classes1, axiom,  (! [A] : v1_ordinal1(k5_classes1(A))) ).
fof(t55_classes1, axiom,  (! [A] :  (v1_ordinal1(A) => k5_classes1(A)=A) ) ).
