Complex numbers
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Complex numbers arise as solutions to quadratic equations whose graph does not intersect the x axis. Their literal syntax is covered in Complex number syntax.

Complex numbers can be taken apart:
real-part ( z -- x )

imaginary-part ( z -- y )

>rect ( z -- x y )

Complex numbers can be constructed from real numbers:
rect> ( x y -- z )

Embedding of real numbers in complex numbers

See also
Complex number syntax