# i

Last modified by Administrator on 2020/08/13 18:57

# Notations of the root of - 1

This page collects the notations of the symbol "i" which represents the square root of ~~1 with positive imaginary part in the complex plane.~~

### Descriptions of this Symbol

- the OpenMath symbol nums1#i
- imaginaryi in MathML3
- Imaginary Unit in MathWorld
- imaginary unit in WikiPedia

Put your observations here...

#### Observation: English USA

- As found in algebra for high-schools and colleges book, the square root of \(-1\) represented in page number 132 as shown in the image on the right.

- But the engineering mathematics book shows the imaginary unit example in page number 9, where uses \(j\) instead of \(i\).

- And also in the other English electrical engineering book, we find in page number 101 the example represents \(j\) instead of \(i\).

- When we see MATLAB 6 for engineers book, we find in page 26 that the imaginary unit stored in MATLAB in the constants \(j\) and \(i\).

#### Observation: Spanish

- The Spanish book - 'Análisis matemático' - shows the imaginary unit example in page 22.

- But the example in the electrical engineering book which called 'Problemas de teoría de circuitos' represents \(j\) instead of \(i\) in page 177. Usually, in electrical and electronics books \(i\) represents electrical current, so \(j\) is used instead to represent the imaginary unit.

- Also another engineering book called 'Principios de electricidad y electrónica' uses \(j\) instead of \(i\) in the imaginary unit page 40.

#### Observation: German

- We see in the German book - 'Diskrete Mathematik' - the the imaginary unit shown in page 397.

#### Observation: French

- In Introduction aux mathématiques discrètes book, we find the imaginary unit shown in page 26.

#### Finnish

Imaginary Unit symbol is shown in the Finish book MAOL-taulukot in page number 26, and it is called 'Imaginaariyksikkö' in Finnish context.

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