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  2. Regular expression - Wikipedia

    en.wikipedia.org/wiki/Regular_expression

    A regular expression (shortened as regex or regexp), [1] sometimes referred to as rational expression, [2] [3] is a sequence of characters that specifies a match pattern in text. ...

  3. Googol - Wikipedia

    en.wikipedia.org/wiki/Googol

    A googol is the large number 10 100 or ten to the power of one hundred. In decimal notation, it is written as the digit 1 followed by one hundred zeros: 10, 000, 000 ...

  4. Names of large numbers - Wikipedia

    en.wikipedia.org/wiki/Names_of_large_numbers

    Depending on context (i.e. language, culture, region, ...) some large numbers have names that allow for describing large quantities in a textual form; not mathematical.For very large values, the text is generally shorter than a decimal numeric representation although longer than scientific notation.

  5. Rotation matrix - Wikipedia

    en.wikipedia.org/wiki/Rotation_matrix

    In linear algebra, a rotation matrix is a transformation matrix that is used to perform a rotation in Euclidean space.For example, using the convention below, the matrix = [⁡ ⁡ ⁡ ⁡]

  6. Smith normal form - Wikipedia

    en.wikipedia.org/wiki/Smith_normal_form

    The first goal is to find invertible square matrices and such that the product is diagonal. This is the hardest part of the algorithm. Once diagonality is achieved, it becomes relatively easy to put the matrix into Smith normal form.

  7. XXXTentacion - Wikipedia

    en.wikipedia.org/wiki/XXXTentacion

    Jahseh Dwayne Ricardo Onfroy (January 23, 1998 – June 18, 2018), known professionally as XXXTentacion, [c] was an American rapper and singer-songwriter. [14] [15] Though a controversial figure due to his widely publicized legal troubles, XXXTentacion gained a cult following among his young fan base during his short career with his depression-and alienation-themed music.

  8. Wikipedia:Shortcut table/lowercase - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Shortcut_table/...

    Here are all the lowercase one-, two-, and three-letter shortcuts on Wikipedia. (Note that some of them might not be shortcuts at all, especially real words in the three-letter range.)

  9. List of reporting marks: R - Wikipedia

    en.wikipedia.org/wiki/List_of_reporting_marks:_R

    RABU - Rabanco Companies [1]; RACN - Raccoon River Railroad; RACU - Acciona Logistica [2]; RACX - General Electric Rail Services Corporation; RACX - Union Tank Car Company [3] (child mark of UTCX)