4
\documentclass{article}

\usepackage{amsmath,amssymb,amsthm} 


\begin{document}

let 
$
\begin{array}{cccc}
f: & \mathbb{R}&\longrightarrow &]-1,1[\\
&x&\mapsto & \dfrac{x}{1+|x|}
\end{array}
$ 
be a continuous function 

\end{document}

can I put $f$ in the same line of the texte ?

1
  • You might want to use the interval package to format that ] - 1,1[, note how in all the examples below, the minus has the wrong spacing (because ] is used in a wrong context. The interval package let's you use this syntax while also making signs appear the correct way and not like here where it acts as an addition
    – daleif
    Jul 27, 2019 at 21:09

3 Answers 3

3

I would do that with aligned– simpler code and better spacing. A small improvement with colon in the place of a real colon (better spacing) and the \mfrac command, preferably to \dfrac for online maths:

\documentclass{article}

\usepackage{mathtools, amssymb, amsthm}
\usepackage{nccmath}

\begin{document}

let
$ \begin{aligned}[t]
f\colon \mathbb{R}&\longrightarrow ]-1,1[\\[-0.5ex]
x & \longmapsto \mfrac{x}{1+|x|}
\end{aligned}\; $
be a continuous function

\end{document} 

enter image description here

2

array has an optional argument to specify which line of the array should be placed on the baseline of the surrounding text, so just do \begin{array}[t]{cccc}. t for top, aligns the first row of the array with the text.

enter image description here

\documentclass{article}

\usepackage{amsmath,amssymb,amsthm} 


\begin{document}

let 
$
\begin{array}[t]{cccc}
f: & \mathbb{R}&\longrightarrow &]-1,1[\\
&x&\mapsto & \dfrac{x}{1+|x|}
\end{array}
$ 
be a continuous function 

\end{document}
2
  • what it means [t] please? Jul 26, 2019 at 15:56
  • @PolineSandra I edited my answer a bit after first posting it, is it still unclear? Jul 26, 2019 at 15:58
0

Considering that the tag is also arrays (peraphs is off-topic with lot of sincerity) you could use also tikz-cd or a matrix. My proposal is this MWE. enter image description here

\documentclass[a4paper,12pt]{article}
\usepackage{mathtools}
\usepackage{tikz-cd}
\usepackage{amssymb}
\usepackage{lipsum}

\begin{document}
let \begin{tikzcd}[column sep=.15in,row sep=-.1in]
f\colon \mathbb{R} \arrow[r] & {]-1,1[}         \\
x \arrow[r, maps to]         & \frac{x}{1+|x|}
\end{tikzcd} be a continuous function \lipsum[1]
\end{document}

Of course, you should take into account that the two mathematical lines affect in the space colored with the red color if there is more text.

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