1. Geany: V1.29 2. GTK+: V2.24.30; 3. My OS: Linux Mint 18.1 Serena Cinnamon Edition;
If putting `$\theta \in [0,2\pi)$` in my TEX file, all the code following it and before `\bibliographystyle{abbrv}` is not highlight. If I chang it to `$\theta \in$ $[0,2\pi)$`, it's good.