% Mizar problem: t74_zfmisc_1,zfmisc_1,876,76 
fof(t74_zfmisc_1,conjecture,(
    ! [A,B,C] : ~ ( k4_xboole_0(k2_tarski(A,B),C) != k1_xboole_0
      & k4_xboole_0(k2_tarski(A,B),C) != k1_tarski(A)
      & k4_xboole_0(k2_tarski(A,B),C) != k1_tarski(B)
      & k4_xboole_0(k2_tarski(A,B),C) != k2_tarski(A,B) ) ),
    inference(mizar_bg_added,[status(thm)],[antisymmetry_r2_hidden,commutativity_k2_tarski,dt_k1_tarski,dt_k1_xboole_0,dt_k2_tarski,dt_k4_xboole_0,fc1_xboole_0,l39_zfmisc_1,rc1_xboole_0,rc2_xboole_0,t72_zfmisc_1,t73_zfmisc_1]),
    [file(zfmisc_1,t74_zfmisc_1)]).

fof(antisymmetry_r2_hidden,axiom,(
    ! [A,B] : 
      ( r2_hidden(A,B)
     => ~ r2_hidden(B,A) ) ),
    file(hidden,r2_hidden),
    []).

fof(commutativity_k2_tarski,axiom,(
    ! [A,B] : k2_tarski(A,B) = k2_tarski(B,A) ),
    file(tarski,k2_tarski),
    []).

fof(dt_k1_tarski,axiom,(
    $true ),
    file(tarski,k1_tarski),
    []).

fof(dt_k1_xboole_0,axiom,(
    $true ),
    file(xboole_0,k1_xboole_0),
    []).

fof(dt_k2_tarski,axiom,(
    $true ),
    file(tarski,k2_tarski),
    []).

fof(dt_k4_xboole_0,axiom,(
    $true ),
    file(xboole_0,k4_xboole_0),
    []).

fof(fc1_xboole_0,axiom,(
    v1_xboole_0(k1_xboole_0) ),
    file(xboole_0,fc1_xboole_0),
    []).

fof(l39_zfmisc_1,axiom,(
    ! [A,B,C] : 
      ( k4_xboole_0(k2_tarski(A,B),C) = k1_tarski(A)
    <=> ( ~ r2_hidden(A,C)
        & ( r2_hidden(B,C)
          | A = B ) ) ) ),
    file(zfmisc_1,l39_zfmisc_1),
    []).

fof(rc1_xboole_0,axiom,(
    ? [A] : v1_xboole_0(A) ),
    file(xboole_0,rc1_xboole_0),
    []).

fof(rc2_xboole_0,axiom,(
    ? [A] : ~ v1_xboole_0(A) ),
    file(xboole_0,rc2_xboole_0),
    []).

fof(t72_zfmisc_1,axiom,(
    ! [A,B,C] : 
      ( k4_xboole_0(k2_tarski(A,B),C) = k2_tarski(A,B)
    <=> ( ~ r2_hidden(A,C)
        & ~ r2_hidden(B,C) ) ) ),
    file(zfmisc_1,t72_zfmisc_1),
    []).

fof(t73_zfmisc_1,axiom,(
    ! [A,B,C] : 
      ( k4_xboole_0(k2_tarski(A,B),C) = k1_xboole_0
    <=> ( r2_hidden(A,C)
        & r2_hidden(B,C) ) ) ),
    file(zfmisc_1,t73_zfmisc_1),
    []).