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2. Complex multiplication - Wikipedia

   en.wikipedia.org/wiki/Complex_multiplication

   An example of an elliptic curve with complex multiplication is / ([]) where Z[i] is the Gaussian integer ring, and θ is any non-zero complex number. Any such complex torus has the Gaussian integers as endomorphism ring. It is known that the corresponding curves can all be written as

3. Complex number - Wikipedia

   en.wikipedia.org/wiki/Complex_number

   Addition, subtraction and multiplication of complex numbers can be naturally defined by using the rule = along with the associative, commutative, and distributive laws. Every nonzero complex number has a multiplicative inverse. This makes the complex numbers a field with the real numbers as a subfield.

4. 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 ...

5. Multiplication and repeated addition - Wikipedia

   en.wikipedia.org/wiki/Multiplication_and...

   Multiplication is often defined for natural numbers, then extended to whole numbers, fractions, and irrational numbers. However, abstract algebra has a more general definition of multiplication as a binary operation on some objects that may or may not be numbers. Notably, one can multiply complex numbers, vectors, matrices, and quaternions.

6. Mathematics - Wikipedia

   en.wikipedia.org/wiki/Mathematics

   Analysis is further subdivided into real analysis, where variables represent real numbers, and complex analysis, where variables represent complex numbers. Analysis includes many subareas shared by other areas of mathematics which include: [14] Multivariable calculus; Functional analysis, where variables represent varying functions

7. 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.