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.
Complex Number Conjugate - dCode
Tag(s) : Geometry
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Complex Number Conjugate
Complex Conjugate Calculator
Answers to Questions (FAQ)
What is the conjugate of a complex number? (Definition)
The conjugate of a complex number $ 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.
In other words, the conjugate of a complex is the number with the same real part but with opposite imaginary part.
On a complex plane, the points $ z $ and $ \overline{z} $ are symmetrical (symmetry with respect to the x-axis).
How to calculate the conjugate of a complex number?
From the algebraic form of a complex number $ z = a+ib $, the conjugate is calculated $ \overline{z} = a-ib $.
Example: Determine the conjugate of $ z = 1+i $ is to calculate $ \overline{z} = 1-i $
In other words, to find the conjugate of a complex number, take that same complex number but with the opposite (minus sign) of its imaginary part (containing $ i $).
What is a complex conjugate pair?
The set of 2 elements: a complex number $ z $ and its conjugate $ \overline{z} $, form a pair of conjugates.
What are the properties of conjugates?
Using the complex numbers $ 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 number and its conjugate are equal:
$$ |\overline{z}|=|z| $$
What is the product of a complex number and its conjugate?
The multiplication of a complex number $ z = a + ib $ and its conjugate $ \overline{z} = a-ib $ gives: $$ z \times \overline{z} = a^2+b^2 $$
This number is a real number (no imaginary part $ i $) and strictly positive (addition of 2 squares values necessarily positive)
What is the conjugate of i?
The conjugate of the number $ i $ is the number $ -i $
How to calculate the conjugate of a real number (without i)?
The conjugate $ \overline{a} $ of a real number $ a $ is the number $ a $ itself: $ a=a+0i=a-0i=\overline{a} $
Example: $ \overline{1 + 0 \times i} = 1 $
Does the conjugate change the real part of a complex number?
The real part of a complex number always remains unchanged when calculating the conjugate. The real part never changes. $ \Re(z) = \Re(\overline{z}) $
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- Complex Conjugate Calculator
- What is the conjugate of a complex number? (Definition)
- How to calculate the conjugate of a complex number?
- What is a complex conjugate pair?
- What are the properties of conjugates?
- What is the product of a complex number and its conjugate?
- What is the conjugate of i?
- How to calculate the conjugate of a real number (without i)?
- Does the conjugate change the real part of a complex number?
