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Complex Numbers

The square root of negative one, which we now call the imaginary unit, was once thought to be an absurd notion. However, through the diligent studies of open-minded mathematicians, it was shown that the real numbers were actually just one part of a larger set of numbers known as the complex numbers, the other part being the imaginary numbers. Please direct all questions about these surprisingly useful and applicable numbers into this category.

887 Questions

Why complex numbers has no inequality?

Ah! but they can. Using absolute values |3-i|<|3+2i|.

When does a number or value called a solution to an algebraic?

If I understand the question correctly, it is when the algebraic equation (or inequality) is true.

How do you use numbers in your daily life?

when we choose a size of a shirt , in store, the speed of our car the nember of car ,time ,chanels on tv,tempreture the wether

Can a complex number can't be a pure imaginary number?

A complex number can be a pure imaginary, or a pure real number, or a combination of the two. The form for a complex number is a + bi, where a & b can be any real numbers (so if a = 0, then the number is pure imaginary; and if b=0, then it is a real number).

Solved examples of bi complex numbers?

See the related link Answers dot com video for some examples of how to solve.

Why use complex numbers?

One use is to compact a large area into a small one or vice versa. The complex

formula is 1/z, which is inversion. All pairs of complex numbers with absolute value less than 1 will be transformed outside the unit circle and the infinite complex plane will be compacted inside the unit circle! This simple formula produces the real part u=x/(xx+yy) and imaginary part v=-y/(xx+yy). Points approaching infinity will go to zero inside the unit circle!

How are complex numbers used in every day life?

Complex numbers are not used in everyday life, unless you work in some very specific areas, including electrical engineering, or nuclear physics, where those numbers are required, or want to work with fractal art, for example.

Complex numbers are not used in everyday life, unless you work in some very specific areas, including electrical engineering, or nuclear physics, where those numbers are required, or want to work with fractal art, for example.

Complex numbers are not used in everyday life, unless you work in some very specific areas, including electrical engineering, or nuclear physics, where those numbers are required, or want to work with fractal art, for example.

Complex numbers are not used in everyday life, unless you work in some very specific areas, including electrical engineering, or nuclear physics, where those numbers are required, or want to work with fractal art, for example.

Who is hul gu?

Hul Gu, better known as Hulagu Khan and also known as Hulagu, Hülegü, or Hulegu. (c. 1217 - Febuary 8, 1265), was a Mongol ruler who conquered much of Southwest Asia. Son of Tolue and the Kerait princess Sorghaghtani Beki, he was a grandson of Genghis Khan, and the brother of Arik Boke, Mongke and the great Kubalai Khan. Hulagu's army greatly expanded the southwestern portion of the Mongol Empire, founding the Ilkhanate of Persia, a precursor to the eventual Safavid Dynasty, and then the modern state of Iran. Under Hulagu's leadership, the Mongols destroyed the two greatest centers of Islamic power, Baghdad and Damascus, causing a shift of Islamic influence to the Mamluks in Cairo. It was also in Hulagu's reign that historians switched from writing in Arabic, to writing in Persian.

If a and negative b are complex numbers what will make it positive?

Multiplying any complex number by its conjugate will result in a positive real number.

For any complex number x + yi, {x and y are real numbers} its conjugate is x - yi, and the multiplication equals x2 + y2

How do you use complex and imaginary numbers in your daily life?

you would use complex and imaginary numbers in your daily life if you become a mathematician, electrical engineer, quantam mechanic, etc. otherwise, you would not use use them at all except in algebra 2, pre-calc, calculus....i hope that helped a little bit.

What is the real part of a complex product?

A complex number, z, may be written as z = x + iy where x and y are real and i is the imaginary square root of -1.

x is the real part of z and iy is its imaginary part.

The Argand diagram for z would show it as if it had the coordinates (x, y) in the Cartesian plane. However, where the Cartesian plane has the x-axis the Argand diagram has the real part, and where the Cartesian plane has the y-axis the Argand diagram has the imaginary part.

Equivalently, z can be defined in terms of polar coordinates: z = (r, q).

This is the same as z = rcosq + i*rsinq, so the real part is rcosq.

How do you find square root of a complex number?

This is best done if the complex number is in polar coordinates - that is, a distance from the origin, and an angle. Take the square root of the argument (the absolute value) of the complex number; and half the angle.

Does distributive property apply to complex numbers?

Yes, for example (a + bi)(c + di) = ac + adi + bic + bidi, and commutative property works as well --> ac + adi + bci + bdi² --> ac + (ad + bc)i + bd(-1) = (ac - bd) + (ad + bc)i

Are complex numbers closed for finding the square root of a number?

Yes. Also, for finding any other root (cubic root, fourth root, etc.).

The main square root of a complex number can be found easily if it is expressed in polar notation. For example: the square root of 5 at an angle of 46 degrees) the complex number that has the absolute value 5 and an angle of 46 degrees) is equal to the square root of 5, at an angle of 46/2 = 23 degrees.

How do you instantiate a complex number?

The following are the different ways to assign a value to a complex number:

By passing two Double values to its constructor. The first value represents the real, and the second value represents imaginary part of a complex number.

For example,

Complex c1 = new Complex(5, 8); /* It represents (5, 8) */
By assigning a Byte, SByte, Intl6, UIntl6, Int32, UInt32, Int64, UInt64, Single, or Double value to aComplex object. The assigned value represents the real part of the complex number, and its imaginary part becomes0. For example,
Complex c2 = 15.3; /* It represents (15.3, 0) */
By casting a Decimal or BigInteger value to a Complex object.
For example,
Complex c3 = (Complex) 14.7; /* It represents (14.7, 0) */
Assigning the value returned by an operator to a Complex variable.
For example,
Complex c4 = c1 + c2; /* It represents (20.3, 8) */

What is Leonard Euler's famous formula?

eix = cos(x) + i*sin(x)

where e is the irrational number 2.7182...

i is the maginary sq root of -1

and x is measured in radians.

In the special case when x = pi, this reduces to:

eiπ = cos(π) + i*sin(π)

or

eiπ = -1

Why do we use complex numbers?

Complex numbers are theoretically interesting; they help us better understand the real numbers in some cases.They also have some very practical applications, including:

* Electrical circuits - in AC, things like resistance, current, and voltage acquire a phase angle, thus becoming complex numbers.

* Quantum mechanics - the probability amplitude is described with a complex number. As a result, complex numbers basically permeate all of quantum mechanics.