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Complex Number Conjugate

Tool for calculating the value of the conjugate of a complex number. The conjugate of a complex number \( z \) is written \( \overline{z} \) or \( z^* \) and is formed of the same real part with an opposite imaginary part.

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Complex Number Conjugate -

Tag(s) : Mathematics

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Complex Number Conjugate

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Tool for calculating the value of the conjugate of a complex number. The conjugate of a complex number \( z \) is written \( \overline{z} \) or \( z^* \) and is formed of the same real part with an opposite imaginary part.

Answers to Questions

How to calculate the conjugate of a complex number?

The conjugate of a complex numberhref \( z = a+ib \) is noted with a bar \( \overline{z} \) (or sometimes with a star \( z^* \)) and is equal to \( \overline{z} = a-ib \) with \( a = \Re{z} \) the real part and \( b = \Im{z} \) the imaginary part.

Example: Consider \( z = 1 + i \) then the conjugate is \( \overline{z} = 1-i \)

On a complex plane, the points \( z \) and \( \overline{z} \) are symmetrical with respect to the abscissa axis.

What are the properties of conjugates?

Consider the complex numbershref \( z, z_1, z_2 \), the conjugate has the following properties:

$$ \overline{z_1+z_2} = \overline{z_1} + \overline{z_2} $$

$$ \overline{z_1 \cdot z_2} = \overline{z_1} \times \overline{z_2} $$

$$ \overline{\left(\frac{z_1}{z_2}\right)} = \frac{\overline{z_1}}{\overline{z_2}} \iff z_2 \neq 0 $$

A number without an imaginary part is equal to its conjugate:

$$ \Im(z) = 0 \iff \overline{z} = z $$

The modulus of a complex numberhrefhref and its conjugate are equal:

$$ |\overline{z}|=|z| $$

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