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  2. Hypercube - Wikipedia

    en.wikipedia.org/wiki/Hypercube

    In geometry, a hypercube is an n-dimensional analogue of a square (n = 2) and a cube (n = 3).It is a closed, compact, convex figure whose 1-skeleton consists of groups of opposite parallel line segments aligned in each of the space's dimensions, perpendicular to each other and of the same length.

  3. Triangular number - Wikipedia

    en.wikipedia.org/wiki/Triangular_number

    By analogy with the square root of x, one can define the (positive) triangular root of x as the number n such that T n = x: [18] = + which follows immediately from the quadratic formula . So an integer x is triangular if and only if 8 x + 1 is a square.

  4. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    The greatest cube it is greater than is 3, so the first digit of the two-digit cube must be 3. Therefore, the cube root of 29791 is 31. Another example: Find the cube root of 456533. The cube root ends in 7. After the last three digits are taken away, 456 remains. 456 is greater than all the cubes up to 7 cubed. The first digit of the cube root ...

  5. Square root of 3 - Wikipedia

    en.wikipedia.org/wiki/Square_root_of_3

    The space diagonal of the unit cube is √ 3. Distances between vertices of a double unit cube are square roots of the first six natural numbers, including the square root of 3 (√7 is not possible due to Legendre's three-square theorem) This projection of the Bilinski dodecahedron is a rhombus with diagonal ratio √ 3.

  6. De Moivre's formula - Wikipedia

    en.wikipedia.org/wiki/De_Moivre's_formula

    To find the roots of a quaternion there is an analogous form of de Moivre's formula. A quaternion in the form ... Then the cube roots are given by: = ...

  7. Geometric mean - Wikipedia

    en.wikipedia.org/wiki/Geometric_mean

    The geometric mean of a data set {,, …,} is given by: (=) =. [3]The above figure uses capital pi notation to show a series of multiplications. Each side of the equal sign shows that a set of values is multiplied in succession (the number of values is represented by "n") to give a total product of the set, and then the nth root of the total product is taken to give the geometric mean of the ...

  8. Fast inverse square root - Wikipedia

    en.wikipedia.org/wiki/Fast_inverse_square_root

    Lighting and reflection calculations, as in the video game OpenArena, use the fast inverse square root code to compute angles of incidence and reflection.. Fast inverse square root, sometimes referred to as Fast InvSqrt() or by the hexadecimal constant 0x5F3759DF, is an algorithm that estimates , the reciprocal (or multiplicative inverse) of the square root of a 32-bit floating-point number in ...

  9. Splitting field - Wikipedia

    en.wikipedia.org/wiki/Splitting_field

    An extension L that is a splitting field for a set of polynomials p(X) over K is called a normal extension of K.. Given an algebraically closed field A containing K, there is a unique splitting field L of p between K and A, generated by the roots of p.

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