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  2. Imaginary number - Wikipedia

    en.wikipedia.org/wiki/Imaginary_number

    An imaginary number is the product of a real number and the imaginary unit i, [note 1] which is defined by its property i 2 = −1. [1] [2] The square of an imaginary number bi is −b 2. For example, 5i is an imaginary number, and its square is −25. The number zero is considered to be both real and imaginary. [3]

  3. Complex number - Wikipedia

    en.wikipedia.org/wiki/Complex_number

    A real number a can be regarded as a complex number a + 0i, whose imaginary part is 0. A purely imaginary number bi is a complex number 0 + bi, whose real part is zero. It is common to write a + 0i = a, 0 + bi = bi, and a + (−b)i = a − bi; for example, 3 + (−4)i = 3 − 4i.

  4. Class number problem - Wikipedia

    en.wikipedia.org/wiki/Class_number_problem

    In mathematics, the Gauss class number problem (for imaginary quadratic fields), as usually understood, is to provide for each n ≥ 1 a complete list of imaginary quadratic fields (for negative integers d) having class number n.

  5. 10 Hard Math Problems That Even the Smartest People in the ...

    www.aol.com/10-hard-math-problems-even-150000090...

    When s is a complex number—one that looks like a+b𝑖, using the imaginary number 𝑖—finding 𝜁(s) gets tricky. ... For larger numbers, or a general form, the problem is wide open. There ...

  6. Complex plane - Wikipedia

    en.wikipedia.org/wiki/Complex_plane

    This problem arises because the point z = 0 has just one square root, while every other complex number z ≠ 0 has exactly two ... when z is a pure imaginary number. ...

  7. Stark–Heegner theorem - Wikipedia

    en.wikipedia.org/wiki/Stark–Heegner_theorem

    In number theory, the Heegner theorem [1] establishes the complete list of the quadratic imaginary number fields whose rings of integers are principal ideal domains. It solves a special case of Gauss's class number problem of determining the number of imaginary quadratic fields that have a given fixed class number.

  8. Newton's method - Wikipedia

    en.wikipedia.org/wiki/Newton's_method

    The number of correct digits roughly doubles with each step. ... Arthur Cayley in 1879 in The Newton–Fourier imaginary problem was the first to notice the ...

  9. Millennium Prize Problems - Wikipedia

    en.wikipedia.org/wiki/Millennium_Prize_Problems

    The other six Millennium Prize Problems remain unsolved, despite a large number of unsatisfactory proofs by both amateur and professional mathematicians. Andrew Wiles , as part of the Clay Institute's scientific advisory board, hoped that the choice of US$ 1 million prize money would popularize, among general audiences, both the selected ...

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