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  2. Complex plane - Wikipedia

    en.wikipedia.org/wiki/Complex_plane

    Argand diagram refers to a geometric plot of complex numbers as points z = x + iy using the horizontal x-axis as the real axis and the vertical y-axis as the imaginary axis. [3] Such plots are named after Jean-Robert Argand (1768–1822), although they were first described by Norwegian–Danish land surveyor and mathematician Caspar Wessel ...

  3. Argument (complex analysis) - Wikipedia

    en.wikipedia.org/wiki/Argument_(complex_analysis)

    Figure 1. This Argand diagram represents the complex number lying on a plane.For each point on the plane, arg is the function which returns the angle . In mathematics (particularly in complex analysis), the argument of a complex number z, denoted arg(z), is the angle between the positive real axis and the line joining the origin and z, represented as a point in the complex plane, shown as in ...

  4. Complex number - Wikipedia

    en.wikipedia.org/wiki/Complex_number

    A complex number can be visually represented as a pair of numbers (a, b) forming a vector on a diagram called an Argand diagram, representing the complex plane. Re is the real axis, Im is the imaginary axis, and i is the "imaginary unit", that satisfies i 2 = −1.

  5. Mathematical diagram - Wikipedia

    en.wikipedia.org/wiki/Mathematical_diagram

    Argand diagram. A complex number can be visually represented as a pair of numbers forming a vector on a diagram called an Argand diagram The complex plane is sometimes called the Argand plane because it is used in Argand diagrams.

  6. Jean-Robert Argand - Wikipedia

    en.wikipedia.org/wiki/Jean-Robert_Argand

    Jean-Robert Argand (UK: / ˈ ɑːr ɡ æ n d /, US: / ˌ ɑːr ˈ ɡ ɑː n (d)/, [1] [2] French: [ʒɑ̃ ʁɔbɛʁ aʁɡɑ̃]; July 18, 1768 – August 13, 1822) was a Genevan amateur mathematician. In 1806, while managing a bookstore in Paris , he published the idea of geometrical interpretation of complex numbers known as the Argand diagram ...

  7. Argand system - Wikipedia

    en.wikipedia.org/wiki/Argand_system

    For example, the number line is the 2nd-order Argand system because the two axes extending from the origin represent 1 and −1, the 2nd roots of unity. The complex plane (sometimes called the Argand plane, also named after Argand) is the 4th-order Argand system because the 4 axes extending from the origin represent 1, i , −1, and − i , the ...

  8. Complex conjugate - Wikipedia

    en.wikipedia.org/wiki/Complex_conjugate

    Geometric representation (Argand diagram) of and its conjugate ¯ in the complex plane.The complex conjugate is found by reflecting across the real axis.. In mathematics, the complex conjugate of a complex number is the number with an equal real part and an imaginary part equal in magnitude but opposite in sign.

  9. Euclidean plane - Wikipedia

    en.wikipedia.org/wiki/Euclidean_plane

    The complex plane is sometimes called the Argand plane because it is used in Argand diagrams. These are named after Jean-Robert Argand (1768–1822), although they were first described by Danish-Norwegian land surveyor and mathematician Caspar Wessel (1745–1818). [ 4 ]