How to add a short text in math-mode keeping spaces between words

Question

I am writing the following:

$$p(Z_{n+m}=i for some m> 0|Z_{n}=i)=1$$

Compiling, the spaces between the words "i for some m" are removed giving as a result "iforsomem"

How can I prevent this?

Note that I cannot write something like

$p(Z_{n+m}=i$ for some $m> 0|Z_{n}=i)=1$

because I want it centered horizontally

Thank you for your help!

Use \usepackage{amsmath} and then you can have \text{ for some } or simply use (without amsmath) \mbox{ for some } — user16968
– user16968, Commented Dec 11, 2018 at 18:22
See also tex.stackexchange.com/questions/503/why-is-preferable-to — user16968
– user16968, Commented Dec 11, 2018 at 18:22

egreg · Accepted Answer · 2018-12-11 18:41:05Z

You need to do

\usepackage{amsmath}

in your document and then you can type

\begin{equation*} \text{$p(Z_{n+m}=i$ for some $m>0 \mid Z_{n}=i)=1$} \end{equation*}

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