theorem :: GOBOARD6:65

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