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  2. Russia - Wikipedia

    en.wikipedia.org/wiki/Russia

    Russia, [b] or the Russian Federation, [c] is a country spanning Eastern Europe and North Asia.It is the largest country in the world by area, extending across eleven time zones and sharing land borders with fourteen countries.

  3. Plasma (physics) - Wikipedia

    en.wikipedia.org/wiki/Plasma_(physics)

    [16] [17] [18] It is a state of matter in which an ionized substance becomes highly electrically conductive to the point that long-range electric and magnetic fields dominate its behaviour. [19] [20] Plasma is typically an electrically quasineutral medium of unbound positive and negative particles (i.e., the overall charge of a plasma is ...

  4. Library classification - Wikipedia

    en.wikipedia.org/wiki/Library_classification

    A library book shelf in Hong Kong arranged using the Dewey classification. A library classification is a system used within a library to organize materials, including books, sound and video recordings, electronic materials, etc., both on shelves and in catalogs and indexes.

  5. Binary search tree - Wikipedia

    en.wikipedia.org/wiki/Binary_search_tree

    Fig. 1: A binary search tree of size 9 and depth 3, with 8 at the root. In computer science, a binary search tree (BST), also called an ordered or sorted binary tree, is a rooted binary tree data structure with the key of each internal node being greater than all the keys in the respective node's left subtree and less than the ones in its right subtree.

  6. Interquartile range - Wikipedia

    en.wikipedia.org/wiki/Interquartile_range

    Boxplot (with an interquartile range) and a probability density function (pdf) of a Normal N(0,σ 2) Population. In descriptive statistics, the interquartile range (IQR) is a measure of statistical dispersion, which is the spread of the data. [1] The IQR may also be called the midspread, middle 50%, fourth spread, or H‑spread.

  7. The Devil's Dictionary - Wikipedia

    en.wikipedia.org/wiki/The_Devil's_Dictionary

    The Athenaeum Journal, one of the most widely circulated literary periodicals in the world, gave The Devil's Dictionary lengthier consideration and observed: “Dealing with a wide range of topics as well as a great number of words, it presents a sort of summary index of the author’s characteristic views as well as his literary aptitudes and ...

  8. Total order - Wikipedia

    en.wikipedia.org/wiki/Total_order

    Any subset of a totally ordered set X is totally ordered for the restriction of the order on X.; The unique order on the empty set, ∅, is a total order. Any set of cardinal numbers or ordinal numbers (more strongly, these are well-orders).

  9. Alphabetical order - Wikipedia

    en.wikipedia.org/wiki/Alphabetical_order

    Alphabetical order was first used in the 1st millennium BCE by Northwest Semitic scribes using the abjad system. [1] However, a range of other methods of classifying and ordering material, including geographical, chronological, hierarchical and by category, were preferred over alphabetical order for centuries. [2]