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  2. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    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 is 7. The cube root of 456533 is 77. This process can be extended to find cube roots that are 3 digits long, by using arithmetic modulo 11.

  3. Constructible number - Wikipedia

    en.wikipedia.org/wiki/Constructible_number

    Constructible number. The square root of 2 is equal to the length of the hypotenuse of a right triangle with legs of length 1 and is therefore a constructible number. In geometry and algebra, a real number is constructible if and only if, given a line segment of unit length, a line segment of length can be constructed with compass and ...

  4. Cubic field - Wikipedia

    en.wikipedia.org/wiki/Cubic_field

    Definition. If K is a field extension of the rational numbers Q of degree [ K: Q ] = 3, then K is called a cubic field. Any such field is isomorphic to a field of the form. where f is an irreducible cubic polynomial with coefficients in Q. If f has three real roots, then K is called a totally real cubic field and it is an example of a totally ...

  5. Soup Number Five - Wikipedia

    en.wikipedia.org/wiki/Soup_Number_Five

    Type. Soup. Place of origin. Philippines. Main ingredients. Bull 's testes. Soup Number Five, variously spelled Soup No. 5 or Soup #5, is a soup made from bull 's testes [1] [2] or penis. [3] The dish originates from Filipino cuisine. It is believed to have aphrodisiac properties.

  6. 216 (number) - Wikipedia

    en.wikipedia.org/wiki/216_(number)

    In mathematics [ edit] Visual proof that 33 + 43 + 53 = 63. 216 is the cube of 6, and the sum of three cubes: It is the smallest cube that can be represented as a sum of three positive cubes, [1] making it the first nontrivial example for Euler's sum of powers conjecture. It is, moreover, the smallest number that can be represented as a sum of ...

  7. Sphere packing in a cube - Wikipedia

    en.wikipedia.org/wiki/Sphere_packing_in_a_cube

    Sphere packing in a cube. In geometry, sphere packing in a cube is a three-dimensional sphere packing problem with the objective of packing spheres inside a cube. It is the three-dimensional equivalent of the circle packing in a square problem in two dimensions. The problem consists of determining the optimal packing of a given number of ...

  8. Doubling the cube - Wikipedia

    en.wikipedia.org/wiki/Doubling_the_cube

    Doubling the cube, also known as the Delian problem, is an ancient [a] [1] : 9 geometric problem. Given the edge of a cube, the problem requires the construction of the edge of a second cube whose volume is double that of the first. As with the related problems of squaring the circle and trisecting the angle, doubling the cube is now known to ...

  9. nth root - Wikipedia

    en.wikipedia.org/wiki/Nth_root

    In mathematics, taking the nth root is an operation involving two numbers, the radicand and the index or degree. Taking the nth root is written as , where x is the radicand and n is the index (also sometimes called the degree). This is pronounced as "the nth root of x". The definition then of an nth root of a number x is a number r (the root ...