# Using display mode and adding space between text

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 2 '16 at 9:26
• How about \mbox{ for }. – Mico Jun 2 '16 at 9:26
• @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 2 '16 at 9:30
• I'm going to update the question – cpd1 Jun 2 '16 at 10:04
• I ended up using \begin{center} and \mbox to get around this. – cpd1 Jun 2 '16 at 10:14

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 2 '16 at 11:59