# Adding spaces inside a math expression

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

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, $$u = g \qquad \text{in} \qquad \Omega$$
Oddly enough, $$u = g \text{ in } \Omega$$ produces an undefined control sequence error... – Paul Dec 9 '12 at 19:24