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1 dzień 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 .
1 dzień temu · The exponential function is defined on the entire domain of the complex numbers.The definition of sine and cosine can be extended to all complex numbers via = = + These can be reversed to give Euler's formula = + = When plotted on the complex plane, the function for real values of traces out the unit circle in the complex plane.. When is a real number, sine and cosine ...
1 dzień temu · SN 1994D (bright spot on the lower left), a type Ia supernova within its host galaxy, NGC 4526. A supernova (pl.: supernovae or supernovas) is a powerful and luminous explosion of a star.A supernova occurs during the last evolutionary stages of a massive star, or when a white dwarf is triggered into runaway nuclear fusion.The original object, called the progenitor, either collapses to a ...
1 dzień temu · A massive open online course ( MOOC / muːk /) or an open online course is an online course aimed at unlimited participation and open access via the Web. [1] In addition to traditional course materials, such as filmed lectures, readings, and problem sets, many MOOCs provide interactive courses with user forums or social media discussions to ...
1 dzień temu · Teaching English as a second language. v. t. e. Canadian English ( CanE, CE, en-CA) [5] encompasses the varieties of English used in Canada. According to the 2016 census, English was the first language of 19.4 million Canadians or 58.1% of the total population; the remainder spoke French (20.8%) or other languages (21.1%). [6]
1 dzień temu · Linux (/ ˈ l ɪ n ʊ k s /, LIN-uuks) is both an open-source Unix-like kernel and a generic name for a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution (distro), which includes the kernel and supporting system software and ...
1 dzień temu · John F. Kennedy International Airport (IATA: JFK, ICAO: KJFK, FAA LID: JFK) is a major international airport serving New York City and its metropolitan area, in the state of New York, United States.The airport is the busiest of the seven airports in the New York airport system, the 6th-busiest airport in the United States, and the busiest international air passenger gateway into North America.
