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  2. Construction of the real numbers - Wikipedia

    en.wikipedia.org/wiki/Construction_of_the_real...

    An axiomatic definition of the real numbers consists of defining them as the elements of a complete ordered field. [2] [3] [4] This means the following: The real numbers form a set, commonly denoted , containing two distinguished elements denoted 0 and 1, and on which are defined two binary operations and one binary relation; the operations are called addition and multiplication of real ...

  3. vCard - Wikipedia

    en.wikipedia.org/wiki/VCard

    Standard. RFC 6350. vCard, also known as VCF (Virtual Contact File), is a file format standard for electronic business cards. vCards can be attached to e-mail messages, sent via Multimedia Messaging Service (MMS), on the World Wide Web, instant messaging, NFC or through QR code. They can contain name and address information, phone numbers, e ...

  4. Real form (Lie theory) - Wikipedia

    en.wikipedia.org/wiki/Real_form_(Lie_theory)

    In mathematics, the notion of a real form relates objects defined over the field of real and complex numbers. A real Lie algebra g0 is called a real form of a complex Lie algebra g if g is the complexification of g0 : The notion of a real form can also be defined for complex Lie groups. Real forms of complex semisimple Lie groups and Lie ...

  5. Real number - Wikipedia

    en.wikipedia.org/wiki/Real_number

    The long real line pastes together ℵ 1 * + ℵ 1 copies of the real line plus a single point (here ℵ 1 * denotes the reversed ordering of ℵ 1) to create an ordered set that is "locally" identical to the real numbers, but somehow longer; for instance, there is an order-preserving embedding of ℵ 1 in the long real line but not in the real ...

  6. Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

  7. Computable number - Wikipedia

    en.wikipedia.org/wiki/Computable_number

    In mathematics, computable numbers are the real numbers that can be computed to within any desired precision by a finite, terminating algorithm. They are also known as the recursive numbers, [ 1] effective numbers[ 2] or the computable reals[ 3] or recursive reals. [ 4] The concept of a computable real number was introduced by Émile Borel in ...

  8. Google has an illegal monopoly on search, US judge finds

    www.aol.com/news/u-judge-rules-google-monopoly...

    WASHINGTON (Reuters) -A U.S. judge ruled on Monday that Google violated antitrust law, spending billions of dollars to create an illegal monopoly and become the world's default search engine, the ...

  9. Extended real number line - Wikipedia

    en.wikipedia.org/wiki/Extended_real_number_line

    Extended real number line. In mathematics, the extended real number system [a] is obtained from the real number system by adding two infinity elements: and [b] where the infinities are treated as actual numbers. It is useful in describing the algebra on infinities and the various limiting behaviors in calculus and mathematical analysis ...

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