% Mizar problem: t8_exchsort,exchsort,263,55 
fof(t8_exchsort, conjecture,  (! [A] :  ( (v1_relat_1(A) & v1_funct_1(A))  =>  (! [B] :  ( (v1_relat_1(B) & v1_funct_1(B))  =>  ( (k9_xtuple_0(A)=k9_xtuple_0(B) & v1_exchsort(A))  => v1_exchsort(B)) ) ) ) ) ).
fof(dt_k9_xtuple_0, axiom, $true).
fof(rc1_funct_1, axiom,  (? [A] :  (v1_relat_1(A) & v1_funct_1(A)) ) ).
