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  2. Matching distance - Wikipedia

    en.wikipedia.org/wiki/Matching_distance

    Example: The matching distance between = + + and = ′ + ′ is given by (,) = {(, ′), (, ′), (,)} = The core of the definition of matching distance is the observation that the information contained in a size function can be combinatorially stored in a formal series of lines and points of the plane, called respectively cornerlines and ...

  3. Diagonal - Wikipedia

    en.wikipedia.org/wiki/Diagonal

    The ratio of a long diagonal to a side is 2, and the ratio of a short diagonal to a side is . A regular heptagon has 14 diagonals. The seven shorter ones equal each other, and the seven longer ones equal each other. The reciprocal of the side equals the sum of the reciprocals of a short and a long diagonal.

  4. Distance matrix - Wikipedia

    en.wikipedia.org/wiki/Distance_matrix

    the entries on the main diagonal are all zero (that is, the matrix is a hollow matrix), i.e. x ii = 0 for all 1 ≤ i ≤ N, all the off-diagonal entries are positive (x ij > 0 if i ≠ j), (that is, a non-negative matrix), the matrix is a symmetric matrix (x ij = x ji), and; for any i and j, x ij ≤ x ik + x kj for all k (the triangle ...

  5. Pairing function - Wikipedia

    en.wikipedia.org/wiki/Pairing_function

    The graphical shape of Cantor's pairing function, a diagonal progression, is a standard trick in working with infinite sequences and countability. [b] The algebraic rules of this diagonal-shaped function can verify its validity for a range of polynomials, of which a quadratic will turn out to be the simplest, using the method of induction ...

  6. Diagonal matrix - Wikipedia

    en.wikipedia.org/wiki/Diagonal_matrix

    The term diagonal matrix may sometimes refer to a rectangular diagonal matrix, which is an m-by-n matrix with all the entries not of the form d i,i being zero. For example: [ 1 0 0 0 4 0 0 0 − 3 0 0 0 ] or [ 1 0 0 0 0 0 4 0 0 0 0 0 − 3 0 0 ] {\displaystyle {\begin{bmatrix}1&0&0\\0&4&0\\0&0&-3\\0&0&0\\\end{bmatrix}}\quad {\text{or}}\quad ...

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  8. Diagonal form - Wikipedia

    en.wikipedia.org/wiki/Diagonal_form

    is the unit circle in P 2 = is the unit hyperbola in P 2. + + + = gives the Fermat cubic surface in P 3 with 27 lines. The 27 lines in this example are easy to describe explicitly: they are the 9 lines of the form (x : ax : y : by) where a and b are fixed numbers with cube −1, and their 18 conjugates under permutations of coordinates.

  9. Lattice multiplication - Wikipedia

    en.wikipedia.org/wiki/Lattice_multiplication

    A grid is drawn up, and each cell is split diagonally. The two multiplicands of the product to be calculated are written along the top and right side of the lattice, respectively, with one digit per column across the top for the first multiplicand (the number written left to right), and one digit per row down the right side for the second multiplicand (the number written top-down).

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