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2. Complex number - Wikipedia

   en.wikipedia.org/wiki/Complex_number

   This formula distinguishes the complex number i from any real number, since the square of any (negative or positive) real number is always a non-negative real number. With this definition of multiplication and addition, familiar rules for the arithmetic of rational or real numbers continue to hold for complex numbers.

3. cis (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Cis_(mathematics)

   x is the argument of the complex number (angle between line to point and x-axis in polar form). The notation is less commonly used in mathematics than Euler's formula , e ix , which offers an even shorter notation for cos x + i sin x , but cis(x) is widely used as a name for this function in software libraries .

4. Complex conjugate root theorem - Wikipedia

   en.wikipedia.org/wiki/Complex_conjugate_root_theorem

   Since non-real complex roots come in conjugate pairs, there are an even number of them; But a polynomial of odd degree has an odd number of roots; Therefore some of them must be real. This requires some care in the presence of multiple roots; but a complex root and its conjugate do have the same multiplicity (and this lemma is not

5. Complex conjugate - Wikipedia

   en.wikipedia.org/wiki/Complex_conjugate

   In mathematics, the complex conjugate of a complex number is the number with an equal real part and an imaginary part equal in magnitude but opposite in sign. That is, if a {\displaystyle a} and b {\displaystyle b} are real numbers, then the complex conjugate of a + b i {\displaystyle a+bi} is a − b i . {\displaystyle a-bi.}

6. Euler's formula - Wikipedia

   en.wikipedia.org/wiki/Euler's_formula

   In fact, the same proof shows that Euler's formula is even valid for all complex numbers x. A point in the complex plane can be represented by a complex number written in cartesian coordinates. Euler's formula provides a means of conversion between cartesian coordinates and polar coordinates. The polar form simplifies the mathematics when used ...

7. Cayley–Dickson construction - Wikipedia

   en.wikipedia.org/wiki/Cayley–Dickson_construction

   As a complex number consists of two independent real numbers, they form a two-dimensional vector space over the real numbers. Besides being of higher dimension, the complex numbers can be said to lack one algebraic property of the real numbers: a real number is its own conjugate.