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  2. Concatenation - Wikipedia

    en.wikipedia.org/wiki/Concatenation

    For two sets of strings S 1 and S 2, the concatenation S 1 S 2 consists of all strings of the form vw where v is a string from S 1 and w is a string from S 2, or formally S 1 S 2 = { vw : v ∈ S 1, w ∈ S 2}. Many authors also use concatenation of a string set and a single string, and vice versa, which are defined similarly by S 1 w = { vw ...

  3. Row and column vectors - Wikipedia

    en.wikipedia.org/wiki/Row_and_column_vectors

    The transpose (indicated by T) of any row vector is a column vector, and the transpose of any column vector is a row vector: […] = [] and [] = […]. The set of all row vectors with n entries in a given field (such as the real numbers ) forms an n -dimensional vector space ; similarly, the set of all column vectors with m entries forms an m ...

  4. Array (data structure) - Wikipedia

    en.wikipedia.org/wiki/Array_(data_structure)

    For example, a two-dimensional array A with three rows and four columns might provide access to the element at the 2nd row and 4th column by the expression A[1][3] in the case of a zero-based indexing system. Thus two indices are used for a two-dimensional array, three for a three-dimensional array, and n for an n-dimensional array.

  5. Rome's iconic Trevi Fountain reopens after renovation work in ...

    www.aol.com/romes-iconic-trevi-fountain-reopens...

    Rome’s iconic Trevi Fountain reopened Sunday after three months of renovations, just in time for the inauguration of the 2025 Jubilee Holy Year that is expected to draw millions of visitors. To ...

  6. Help:Advanced table formatting - Wikipedia

    en.wikipedia.org/wiki/Help:Advanced_table_formatting

    If just 2 columns are being swapped within 1 table, then cut/paste editing (of those column entries) is typically faster than column-prefixing, sorting and de-prefixing. Another alternative is to copy the entire table from the displayed page, paste the text into a spreadsheet, move the columns as you will.

  7. Kevin Durant slams NBA’s new All-Star Game format minutes ...

    www.aol.com/nba-changes-star-game-format...

    I’m just another guy with another opinion but we’ll see how it works,” the two-time NBA champion added. TNT Sports' Charles Barkley will serve as one of the four 2025 All-Star Game general ...

  8. US presidents with the lowest golf handicaps

    www.aol.com/us-presidents-lowest-golf-handicaps...

    The latter two, however, have raised questions about the quality of Trump's game. Currently, Trump Golf manages 18 courses worldwide. Data reporting by Karim Noorani. Story editing by Carren Jao.

  9. Hadamard matrix - Wikipedia

    en.wikipedia.org/wiki/Hadamard_matrix

    Two Hadamard matrices are considered equivalent if one can be obtained from the other by negating rows or columns, or by interchanging rows or columns. Up to equivalence, there is a unique Hadamard matrix of orders 1, 2, 4, 8, and 12. There are 5 inequivalent matrices of order 16, 3 of order 20, 60 of order 24, and 487 of order 28.