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  2. Portal (series) - Wikipedia

    en.wikipedia.org/wiki/Portal_(series)

    Portal is a series of first-person puzzle-platform video games developed by Valve.Set in the Half-Life universe, the two main games in the series, Portal (2007) and Portal 2 (2011), center on a woman, Chell, forced to undergo a series of tests within the Aperture Science Enrichment Center by a malicious artificial intelligence, GLaDOS, that controls the facility.

  3. Portal:Money - Wikipedia

    en.wikipedia.org/wiki/Portal:Money

    The Money Portal. Money is any item or verifiable record that is generally accepted as payment for goods and services and repayment of debts, such as taxes, in a particular country or socio-economic context. The primary functions which distinguish money are: medium of exchange, a unit of account, a store of value and sometimes, a standard of ...

  4. Identifying marks on euro coins - Wikipedia

    en.wikipedia.org/.../Identifying_marks_on_euro_coins

    Luxembourg euro coins dated 2007-2008 were produced at Monnaie de Paris, in Pessac, France and bear the mint master mark of Hubert Larivière, Director of the Paris Mint. As of 2009, coins are again minted at the Royal Dutch Mint in Utrecht, the Netherlands. Until 2015 it was again the mint master mark of Maarten Brouwer.

  5. Numismatics - Wikipedia

    en.wikipedia.org/wiki/Numismatics

    Numismatics is the study or collection of currency, including coins, tokens, paper money, medals and related objects. Specialists, known as numismatists, are often characterized as students or collectors of coins, but the discipline also includes the broader study of money and other means of payment used to resolve debts and exchange goods .

  6. Change-making problem - Wikipedia

    en.wikipedia.org/wiki/Change-making_problem

    Mathematical definition. Coin values can be modeled by a set of n distinct positive integer values (whole numbers), arranged in increasing order as w 1 through w n.The problem is: given an amount W, also a positive integer, to find a set of non-negative (positive or zero) integers {x 1, x 2, ..., x n}, with each x j representing how often the coin with value w j is used, which minimize the ...

  7. Currency - Wikipedia

    en.wikipedia.org/wiki/Currency

    v. t. e. A currency [a] is a standardization of money in any form, in use or circulation as a medium of exchange, for example banknotes and coins. [1] [2] A more general definition is that a currency is a system of money in common use within a specific environment over time, especially for people in a nation state. [3]

  8. Europa Coins 2007 - Wikipedia

    en.wikipedia.org/wiki/Europa_Coins_2007

    Face Value: Lm5 Alloy: Silver 0.925 Quantity: 15,000 Quality: Silver Proof Issued: 2007 Diameter: 38.61mm Weight: 28.28g Market Value: unknown In 2007, the Central Bank of Malta issued the "La Valette" commemorative coin as the last silver coin denominated in Maltese lira. The obverse of the coins shows the Emblem of Malta with the year of ...

  9. Bitcoin - Wikipedia

    en.wikipedia.org/wiki/Bitcoin

    Bitcoin (abbreviation: BTC; sign: ₿) is the first decentralized cryptocurrency. Nodes in the peer-to-peer bitcoin network verify transactions through cryptography and record them in a public distributed ledger, called a blockchain, without central oversight.

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