theorem :: GOBOARD6:68

for j being Nat
for G being Go-board st 1 <= j & j < width G & 1 < len G holds
LSeg ((((1 / 2) * ((G * (1,j)) + (G * (1,(j + 1))))) - |[1,0]|),((1 / 2) * ((G * (1,j)) + (G * (2,(j + 1)))))) c= ((Int (cell (G,0,j))) \/ (Int (cell (G,1,j)))) \/ {((1 / 2) * ((G * (1,j)) + (G * (1,(j + 1)))))}