Using display mode and adding space between text

Question

I have this...

\[c1*f(n) \leq f(n) \leq c2* f(n)\ \forall n_0 \geq 0\]

For display mode, I want to add additional space before \forall. I'm not too familiar with display mode. I tried just adding space and it doesn't seem do anything.

Related: What is the "correct" way of embedding text into math mode? Do you really want to write "... less than or equal to c2*f(n) for for all n_0 ..." though? Isn't one "for" enough? — Torbjørn T., Jun 02 '16 at 09:26
@TorbjørnT. that's how it was written on the board but yeah it doesn't make sense. How do I add proper spacing then between the two statements? I want both to be on the same line but have some distance between the two — cpd1, Jun 02 '16 at 09:30
I ended up using \begin{center} and \mbox to get around this. — cpd1, Jun 02 '16 at 10:14
LaTeX User guide, p.52 \, thin space; \: medium space; \! negative thin space; and \; thick space. In addition, one can always use \mkern<number>mu or \kern<length>. Also, there is \quad and \qquad for larger spaces. — Steven B. Segletes, Jun 02 '16 at 10:14
Why the center environment? Displayed math is centered by default (in standard classes at least), unless you add fleqn as an option to the documentclass or amsmath. — Torbjørn T., Jun 02 '16 at 10:31
@TorbjørnT. I was just brute forcing a solution. Thanks for proper hanlding and for the tip — cpd1, Jun 02 '16 at 12:33

score 3 · Accepted Answer · answered Jun 02 '16 at 10:40

See an example below. Was the * intended as a multiplication symbol here? In that case I would write \cdot instead, and perhaps you want 1 and 2 as subscripts to the c's? If that is the case, then

\[
c_1\cdot f(n) \leq f(n) \leq c_2 \cdot f(n) \quad \forall n_0 \geq 0
\]

Output of the code below:

\documentclass{article}
\usepackage{amsmath}

\begin{document}
Removing ``for'' altogether. (For a bigger space, use \verb|\qquad|.)
\[
c1* f(n) \leq f(n) \leq c2 * f(n) \quad \forall n_0 \geq 0
\]
But if you want to include it:
\[
c1* f(n) \leq f(n) \leq c2 * f(n) \text{ for } \forall n_0 \geq 0
\]
Or for a little bit more space.
\[
c1* f(n) \leq f(n) \leq c2 * f(n) \quad \text{for} \quad\forall n_0 \geq 0
\]
\end{document}

Thank you! I definitely prefer this way over my hack :) – cpd1 Jun 02 '16 at 11:59 — cpd1, Jun 02 '16 at 11:59

Using display mode and adding space between text

1 Answers1