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19 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 .
19 godz. temu · Definition and purpose. An operating system is difficult to define, but has been called "the layer of software that manages a computer's resources for its users and their applications". Operating systems include the software that is always running, called a kernel—but can include other software as well. The two other types of programs that can run on a computer are system programs—which ...
19 godz. temu · World leaders voice their outrage after Vladimir Putin launches a deadly hypersonic missile attack on multiple Ukrainian cities, with a children's hospital struck in Kyiv. It comes on the eve of a ...
19 godz. temu · Sir Keir Starmer is continuing his "reset" tour of the UK, while chancellor Rachel Reeves is giving her first major speech. Meanwhile, the Tory board will meet later to discuss the leadership contest.
19 godz. temu · Acupuncture [b] is a form of alternative medicine [2] and a component of traditional Chinese medicine (TCM) in which thin needles are inserted into the body. [3] Acupuncture is a pseudoscience; [4] [5] the theories and practices of TCM are not based on scientific knowledge, [6] and it has been characterized as quackery.
