A complex number is a number consisting of a real part and an imaginary part. Complex numbers extend the idea of the one-dimensional number line to the two-dimensional complex plane by using the number line for the real part and adding a vertical axis to plot the imaginary part. In this way the complex numbers contain the ordinary real numbers while extending them in order to solve problems that would be impossible with only real numbers.

Complex numbers are used in many scientific fields, including engineering, electromagnetism, quantum physics, applied mathematics, and chaos theory. Italian mathematician Gerolamo Cardano is the first known to have conceived complex numbers; he called them "fictitious", during his attempts to find solutions to cubic equations in the 16th century. Wikipedia - Complex Numbers

See Also

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12.21 - Fibonacci Whole Numbers v Irrational Decimal near Equivalents
atomic number
cardinal number
Figure 13.05a - Complex Vortex Rotational Dynamics
Figure 3.00 - Infinite Number of Atomoles or Alphanon filling all Space
Figure 9.7 - Two Centers Showing Complex Attraction Dynamics
imaginary number
Indig Numbers
mass number
number
Oxidation Number
proton number
quantum number
real number
Sympsionics
Sympsionics Numbers
wave number