By the way, the type of geometry can be measured Take a (potentially very large) triangle and measure the sum of it's angles. 180 degree? It's euclidean space. More? Elliptic space. Less? Hyperbolic space. Reply
Take a (potentially very large) triangle and measure the sum of it's angles.
180 degree? It's euclidean space. More? Elliptic space. Less? Hyperbolic space.