Çiçi

Çiçi (also, Chichi, Dare-Chichi, and Dera-Chichi) is a village and municipality in the Quba Rayon of Azerbaijan. It has a population of 1,131. The municipality consists of the villages of Çiçi, Qənidərə, and Raziyələr.

References

II (disambiguation)

II is the Roman numeral for two. This may also refer to:

Music

Miscellanea

Imaginary unit

The term imaginary unit or unit imaginary number refers to a solution to the equation x² = -1. By convention, the solution is usually denoted i. Since there is no real number with this property, it extends the real numbers, and under the assumption that the familiar properties of addition and multiplication (namely closure, associativity, commutativity and distributivity) continue to hold for this extension, the complex numbers are generated by including it.

Imaginary numbers are an important mathematical concept, which extends the real number system ℝ to the complex number system ℂ, which in turn provides at least one root for every nonconstant polynomial P(x). (See Algebraic closure and Fundamental theorem of algebra.) The term "imaginary" is used because there is no real number having a negative square.

There are two complex square roots of −1, namely i and −i, just as there are two complex square roots of every real number other than zero, which has one double square root.