Are you looking for imaginary unit?

#### https://en.wikipedia.org/wiki/Imaginary_unit

The imaginary unit or unit imaginary number (i) is a solution to the quadratic equation x 2 + 1 = 0. Since there is no real number with this property, it extends the ...

#### mathworld.wolfram.com/ImaginaryUnit.html

Imaginary Unit. The imaginary number, i.e., the square root of . The imaginary unit is denoted and commonly referred to as "i." Although there are two possible square ...

#### https://www.khanacademy.org/.../e/imaginary_unit_powers

Simplify expressions with base i (the imaginary unit) raised to a positive exponent.

#### https://www.mathsisfun.com/numbers/imaginary-numbers.html

Imaginary Numbers are not "Imaginary" Imaginary Numbers were once thought to be impossible, and so they were called "Imaginary" (to make fun of them).

#### https://en.wikipedia.org/wiki/Complex_number

A complex number is a number that can be expressed in the form a + bi, where a and b are real numbers and i is the imaginary unit, satisfying the equation ...

#### www.virtualnerd.com/algebra-2/quadratics/imaginary-unit-i...

What is the Imaginary Unit i? Note: Every tried to take the square root of a negative number? You'll need the imaginary unit 'i' to write the answer.

#### https://www.merriam-webster.com/dictionary/imaginary unit

Define imaginary unit: the positive square root of minus 1 denoted by i or + √‒̅1̅

#### https://www.mathworks.com/help/matlab/ref/i.html

1i returns the basic imaginary unit. i is equivalent to sqrt(-1). You can use i to enter complex numbers. You also can use the character j as the imaginary unit.

#### https://www.khanacademy.org/math/algebra2/introduction-to-complex...

Sal introduces the imaginary unit i, which is defined by the equation i^2=-1. He then gets to know this special number better by thinking about its powers.

#### www.imaginaryunit.com

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