let x, y, z be set ; :: thesis: ( [<*x,y*>,and2c] in InnerVertices (GFA1CarryStr (x,y,z)) & [<*y,z*>,and2a] in InnerVertices (GFA1CarryStr (x,y,z)) & [<*z,x*>,and2] in InnerVertices (GFA1CarryStr (x,y,z)) & GFA1CarryOutput (x,y,z) in InnerVertices (GFA1CarryStr (x,y,z)) )
set f1 = and2c ;
set f2 = and2a ;
set f3 = and2 ;
set xy = [<*x,y*>,and2c];
set yz = [<*y,z*>,and2a];
set zx = [<*z,x*>,and2];
InnerVertices (GFA1CarryStr (x,y,z)) = {[<*x,y*>,and2c],[<*y,z*>,and2a],[<*z,x*>,and2]} \/ {(GFA1CarryOutput (x,y,z))} by Th42
.= {[<*x,y*>,and2c],[<*y,z*>,and2a],[<*z,x*>,and2],(GFA1CarryOutput (x,y,z))} by ENUMSET1:6 ;
hence ( [<*x,y*>,and2c] in InnerVertices (GFA1CarryStr (x,y,z)) & [<*y,z*>,and2a] in InnerVertices (GFA1CarryStr (x,y,z)) & [<*z,x*>,and2] in InnerVertices (GFA1CarryStr (x,y,z)) & GFA1CarryOutput (x,y,z) in InnerVertices (GFA1CarryStr (x,y,z)) ) by ENUMSET1:def 2; :: thesis: verum