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20 godz. temu · The -sphere with the round metric is an embedded Riemannian submanifold of +.. Let (,) be a Riemannian manifold and let : be an immersed submanifold or an embedded submanifold of .The pullback of is a Riemannian metric on , and (,) is said to be a Riemannian submanifold of (,).. In the case where , the map : is given by () = and the metric is just the restriction of to vectors tangent along .
20 godz. temu · In physics, the special theory of relativity, or special relativity for short, is a scientific theory of the relationship between space and time.In Albert Einstein's 1905 treatment, the theory is presented as being based on just two postulates:. The laws of physics are invariant (identical) in all inertial frames of reference (that is, frames of reference with no acceleration).
20 godz. temu · Educational research. Educational technology (commonly abbreviated as edutech, or edtech) is the combined use of computer hardware, software, and educational theory and practice to facilitate learning. [1] [2] When referred to with its abbreviation, "EdTech", it often refers to the industry of companies that create educational technology.
