theorem :: GOBOARD6:78

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