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