I would like to make a circuit like this: [![](https://i.stack.imgur.com/zHUzM.png)](https://i.stack.imgur.com/zHUzM.png)

but I'm struggling. As far as I know the thing on the right (light bulb) is just omega with the line drawn through the circle. I would except something like this be simple but I'm really struggling. I'm not really sure why we do circuit diagrams like this in discrete maths, it seems to be really non-standard (I can't find anything like it on google!), but the professors managed to typeset it in LaTeX so it must be possible!. Thanks.