% Mizar problem: t50_mcart_1,mcart_1,603,5 
fof(t50_mcart_1, conjecture,  (! [A] :  (! [B] :  (! [C] :  (! [D] : k3_zfmisc_1(k2_zfmisc_1(A, B), C, D)=k4_zfmisc_1(A, B, C, D)) ) ) ) ).
fof(d3_zfmisc_1, axiom,  (! [A] :  (! [B] :  (! [C] : k3_zfmisc_1(A, B, C)=k2_zfmisc_1(k2_zfmisc_1(A, B), C)) ) ) ).
fof(dt_k2_zfmisc_1, axiom, $true).
fof(dt_k3_zfmisc_1, axiom, $true).
fof(dt_k4_zfmisc_1, axiom, $true).
fof(fc6_relat_1, axiom,  (! [A, B] : v1_relat_1(k2_zfmisc_1(A, B))) ).
fof(t49_mcart_1, axiom,  (! [A] :  (! [B] :  (! [C] :  (! [D] : k4_zfmisc_1(A, B, C, D)=k2_zfmisc_1(k2_zfmisc_1(k2_zfmisc_1(A, B), C), D)) ) ) ) ).
