@ -68,6 +68,8 @@ mathematical expressions. Example :
$`\Longrightarrow \quad\forall \overrightarrow{V}\in\mathcal{P}`$$`\quad\exists ! (\alpha,\beta)\in\mathbb{R}^2`$$`\quad
\overrightarrow{V}=\alpha\cdot\overrightarrow{a}+\beta\cdot\overrightarrow{b}`$
https://en.wikipedia.org/wiki/ISO_31-11
---
## Colección de elementos del curso: conceptos, vocabulario y ecuaciones / Collection d'éléments de cours : Concepts, vocabulaire et équations / Collection of Course Elements: Concepts, Vocabulary and Equations
@ -258,6 +260,13 @@ $`M=M(\alpha, \beta, \gamma)`$.
[EN] There are *several possible ways to define spatial coordinates* : We speak of
** coordinate systems**.
* [ES]
[FR]
[EN] Specific alphanumeric characters are defined for some widely used coordinate systems :< br >
\- cartesian : $`(x, y, z)`$ or $`(O, x_1, x_2, x_3)`$< br >
\- cylindric : $`(\rho, \phi, z)`$ or $`(r, \phi, z)`$< br >
\- spheric : $`(x, y, z)`$ or $`(O, x_1, x_2, x_3)`$< br >
#### Características de una base / Caractéristiques d’une base et d’un repère / Characteristics of a base
