fof(th_4n_01,axiom,(![P1,P2,A,L]:(plane(P1)&plane(P2)&point(A)&line(L)&P1!=P2&inc_po_pl(A,P1)&inc_po_pl(A,P2)&inc_l_pl(L,P1)&inc_l_pl(L,P2))=>(inc_po_l(A,L)))).
