https://s0.wp.com/latex.php?latex=%5Cdisplaystyle+b_1%28H%29+%3D+%5Cdim+H%5E1%28H%2C+%5Cmathbb%7BQ%7D%29+%3D+%5Cdim+%5Ctext%7BHom%7D%28H%2C+%5Cmathbb%7BQ%7D%29&bg=ffffff&fg=333333&s=0&c=20201002