An imaginary number is a real number multiplied by the square root of $-1$ which is referred to as the "imaginary unit."

We usually write $\sqrt{-1}$ as either $i$ or $j.$

Adding an imaginary number and a real number results in a Complex Number.

AGentleIntroductionToTimeComplexity AbsoluteValue AlgebraicNumber CategoryMetaTopic CauchySequence CommonCoreDomains CommonFactor ComplexConjugate DifferenceOfTwoSquares DividingComplexNumbers Divisor DomainOfAFunction EuclideanAlgorithm FactoringQuadratics FundamentalTheoremOfAlgebra HolomorphicFunction InverseFunction IrrationalNumber IsaacNewton Logarithm MagnitudeOfAVector MathematicsTaxonomy MultiplyingComplexNumbers PolarRepresentationOfAComplexNumber Polynomial Quaternion Root RootTwoIsIrrational RootsOfPolynomials SiteNavigation Surd WhatIsATopic	AddingComplexNumbers MagnitudeOfAComplexNumber NewtonsMethod RiemannSurface			AddingRealNumbers BasinOfAttraction FermatNumber PythagorasTheorem RiemannZetaFunction SquareNumber
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AddingComplexNumbers ArgandDiagram CategoryMetaTopic CoDomainOfAFunction ComplexConjugate ComplexPlane DividingComplexNumbers DomainOfAFunction Euler Function ImageOfAFunction MultiplyingComplexNumbers PolarRepresentationOfAComplexNumber RiemannSurface Root	(none)			AlgebraicNumber CauchySequence ContinuedFraction DedekindCut IrrationalNumber RationalNumber TranscendentalNumber

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Imaginary Number