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complex number

complex number

1 6.3
A number with a real part and an imaginary part written as a + bi
  • noun
  • /ˈkɒmplɛks ˈnʌmbər/
  • Specialized
translation icon : número complejo
  • Whether you're looking at rational numbers, real numbers, complex numbers, or whatever, they form a mathematical structure called a field.

You can project it from the top onto the plane, and you can think of the plane in terms of complex numbers, XIY.

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Examples

  • The complex number 394.12095190904 gets broken down into its major components, making it easy to retrace how the number was built and what it is about, namely, the cultural history of food in twentieth-century Korea.

    Academic text (2013)
  • Let's take a complex number C and let's associate to this complex number the following function.

  • What about our other complex number W?

  • Understanding complex numbers as being two-dimensional is hardly original, but it allows a useful visualization.

    Blog text (1)
  • Multiplying complex numbers involves rotations and scaling.

    Blog text (9)
  • In the 1970s, Benoit Mandelbrot explored the properties of a simple recursive set based on complex numbers.

    Academic text (2004)
  • Just as real numbers form a "number line," complex numbers form a "number plane," traditionally drawn such that the pure real numbers are along the horizontal axis and the pure imaginaries are along the vertical axis.

    Blog text (9)
  • New built-in functions enhance IGOR's image processing features and handling of complex numbers, while maintaining the emphasis on large data sets, fast graph updates, extensive control of graphs, and publication-quality output.

    Academic text (1998)
  • A complex number can be represented as 4 + 5i, where 4 is the real part and 5 is the imaginary part.

  • In mathematics, a complex number consists of a real part and an imaginary part, such as in 1 - 2i.

Synonyms

imaginary number
vscomplex number
  • Specialized
1 7.9

A number in the form a plus b i, where i is the square root of minus one

is the standard term used in mathematics for that same form
imaginary
vscomplex number
  • Specialized
1 9.9

A number that has the square root of negative one

covers the general a plus b i form without requiring a negative square
complex quantity
vscomplex number
  • Specialized
9.0

A number with one real part and one imaginary part

is the more common mathematical name for the same concept

Antonyms

real number
  • Specialized
9 3.9

A value that can be shown on a straight line, like 3, 1/2, or pi

Surface Forms

Morphology

complex + number

The phrase literally combines 'complex' (not simple, made of parts) and 'number', so a learner could infer it refers to a number with extra/compound parts, giving partial insight. However, the specific mathematical definition (a + bi with the imaginary unit i) is specialized and cannot be fully derived from the everyday senses of the constituents without domain knowledge, so the expression is only partially predictable.

Etymology

Complex number comes from the idea of a number 'made of two parts': a real part and an 'imaginary' part, written as a + bi. That's why it means a single number that joins a (the real part) and bi (the imaginary part).