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  2. Upwork - Wikipedia

    en.wikipedia.org/wiki/Upwork

    In 2015, the new company was rebranded as Upwork, which coincided with an upgrade of the oDesk platform under the same name. The newly named Upwork also planned to phase out the Elance platform within a couple of years. [10] The company was listed on the Inc. 5000 list from 2009 to 2014 and filed for an initial public offering on October 3, 2018.

  3. Lists of problems - Wikipedia

    en.wikipedia.org/wiki/Lists_of_problems

    The following articles contain lists of problems: List of philosophical problems; List of undecidable problems; Lists of unsolved problems; List of NP-complete problems;

  4. VAT identification number - Wikipedia

    en.wikipedia.org/wiki/VAT_identification_number

    From 1 January 2020, the valid VAT number of the customer is a material requirement to be able to apply the zero VAT rate for intra-Community supplies of goods in the EU. If the customer’s VAT number is not valid, 0% VAT rate cannot be applied. Companies must make sure that the VAT numbers of their customers are checked. [4]

  5. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

  6. List of gig economy companies - Wikipedia

    en.wikipedia.org/wiki/List_of_gig_economy_companies

    The Sharing Economy: Legal Problems of a Permutations and Combinations Society. Newcastle upon Tyne: Cambridge Scholars Publishing. ISBN 978-1-5275-2076-9; Kennedy, Paul (2016). Vampire Capitalism: Fractured Societies and Alternative Futures. London: Palgrave Macmillan. ISBN 978-1-137-55265-5

  7. List of official business registers - Wikipedia

    en.wikipedia.org/wiki/List_of_official_business...

    List of EU VAT Taxpayers – includes those Polish taxpayers who obtained registration allowing to perform intra-community supply transactions and to use their NIP with the PL-prefix as their EU VAT number; not mandatory for VAT-exempt entities involved in intra-community supply transactions worth altogether less than 50000PLN in the given year ...

  8. List of mathematical abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical...

    This following list features abbreviated names of mathematical functions, function-like operators and other mathematical terminology. This list is limited to abbreviations of two or more letters (excluding number sets). The capitalization of some of these abbreviations is not standardized – different authors might use different capitalizations.

  9. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    The following list includes the continued fractions of some constants and is sorted by their representations. Continued fractions with more than 20 known terms have been truncated, with an ellipsis to show that they continue. Rational numbers have two continued fractions; the version in this list is the shorter one.