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  2. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for arithmetic operations ...

  3. Cayley table - Wikipedia

    en.wikipedia.org/wiki/Cayley_table

    The group {1, −1} above and the cyclic group of order 3 under ordinary multiplication are both examples of abelian groups, and inspection of the symmetry of their Cayley tables verifies this. In contrast, the smallest non-abelian group, the dihedral group of order 6, does not have a symmetric Cayley table.

  4. Multiplication algorithm - Wikipedia

    en.wikipedia.org/wiki/Multiplication_algorithm

    In prehistoric time, quarter square multiplication involved floor function; that some sources [7] [8] attribute to Babylonian mathematics (2000–1600 BC). Antoine Voisin published a table of quarter squares from 1 to 1000 in 1817 as an aid in multiplication.

  5. Magic square - Wikipedia

    en.wikipedia.org/wiki/Magic_square

    An extension of the above example for Orders 8 and 12 First generate a pattern table, where a '1' indicates selecting from the square where the numbers are written in order 1 to n 2 (left-to-right, top-to-bottom), and a '0' indicates selecting from the square where the numbers are written in reverse order n 2 to 1.

  6. Mathematical chess problem - Wikipedia

    en.wikipedia.org/wiki/Mathematical_chess_problem

    A mathematical chess problem is a mathematical problem which is formulated using a chessboard and chess pieces. These problems belong to recreational mathematics.The most well-known problems of this kind are the eight queens puzzle and the knight's tour problem, which have connection to graph theory and combinatorics.

  7. Ultimate tic-tac-toe - Wikipedia

    en.wikipedia.org/wiki/Ultimate_tic-tac-toe

    Incomplete ultimate tic-tac-toe game (the large 'X's and 'O's represent small boards that are won by that player). The previous move was O playing in the center square of the bottom-right board, forcing X to play their next move in smaller board located in the center of the larger board (highlighted in blue).

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