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I want to my statement to say u = g in Omega. I tried coding $$u=g in \Omega$$, but this results in no spaces around the word 'in'. How can I insert them?

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\textrm{ in } or with amsmath \text{ in } or even \in? –  Qrrbrbirlbel Dec 9 '12 at 19:07
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Are you using plain TeX, or LaTeX? If using the latter, see Why is \[ … \] preferable to $$? and Are \( and \) preferable to $? –  Werner Dec 9 '12 at 19:28

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up vote 3 down vote accepted

One way is $$u = g \text{ in } \Omega$$

Or, if you don't need the display with two dollar signs, $u = g$ in $\Omega$

Or, if you want a bigger space, $$u = g \quad \text{in} \quad \Omega$$

Or, for an even bigger space, $$u = g \qquad \text{in} \qquad \Omega$$

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Oddly enough, $$u = g \text{ in } \Omega$$ produces an undefined control sequence error... –  Paul Dec 9 '12 at 19:24
    
Did you see the comment by Qrrbrbirlbel? Did you do \usepackage{amsmath} Try that and see if that fixes it. –  Graphth Dec 9 '12 at 19:46

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