19/10/17 21:42:47 UghKwKrd0.net
Modulo a ton of details, we have shown that the square torus has
no edges at all. At every point it “looks locally” like the Euclidean
plane. In particular, it is perfectly flat at every point. At the same
time, the square torus is bounded, like the sphere.
和訳 よろしくお願いします。