theorem Th50: :: GOBOARD6:50

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