% Mizar problem: t51_classes1,classes1,1597,51 
fof(t51_classes1, conjecture,  (! [A] : v1_ordinal1(k5_classes1(A))) ).
fof(dt_k5_classes1, axiom, $true).
fof(fc3_classes1, axiom,  (! [A] : v1_ordinal1(k5_classes1(A))) ).
