Spacetime is any mathematical model that fuses the three dimensions of space (length, width, and depth) and the one dimension of time into a single four-dimensional manifold. It represents the “stage” in which physical phenomena take place.

Space-time is a physical concept that combines our traditionally distinct classical notions of space and time into a single homogeneous entity. The introduction of space-time is a direct consequence of special relativity, which establishes an equivalence between space and time.

Just as in our classical view of space its three component dimensions are equivalent and homogeneous with respect to each other and to the observer (what one observer considers to be in front of or behind may be considered to be to the right or left by another observer in a different position), the relativistic view also assimilates the temporal dimension (before and after) to the three spatial dimensions, making it perceivable differently by observers under different conditions.

The points in space-time are called events, and each of them corresponds to a phenomenon occurring at a certain spatial location and at a certain time. Each event is therefore identified by four coordinates. In general, three Cartesian coordinates, determined by the choice of an orthogonal reference triplet, are used to represent spatial coordinates.

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