For every x1, x2, y Z, soit H (x1, x2, y) ={(x, y)|xZxxx} , for every x, y1, y2 Z, soit V (x, y1, y2) ={(x, y) |y Z y1 y y2}. Give a definition in extensions of the sets: H (0,5,1) H ( 3,7,1) . Written in LaTeX