That's in the article on Minkowski space. It's actually a good summary, with a hyperlink to manifold. Here's the introduction to the "spacetime" page: > In ph

That's in the article on Minkowski space. It's actually a good summary, with a hyperlink to manifold. Here's the introduction to the "spacetime" page: > In physics, spacetime, also called the space-time continuum, is a mathematical model that fuses the three dimensions of space and the one dimension of time into a single four-dimensional continuum. Spacetime diagrams are useful in visualizing and understanding relativistic effects, such as how different observers perceive where and when events occur.