Vote up / down if you would / would not prefer to add to Martin Sleziak's proposal some language about cross-posting as follows:

> To improve the chances of your question getting an answer make sure that it:
>
> * Is about mathematics at [graduate or higher level](https://mathoverflow.net/help/on-topic). (Use [other sites](https://meta.mathoverflow.net/q/3760) for general mathematical questions.)
> * Includes the necessary background and has an informative title. (See also: [How to write a good MathOverflow question?](https://meta.mathoverflow.net/q/882))
>  * Is properly formatted - use [MathJax (TeX-like syntax)](https://meta.mathoverflow.net/q/3763) for writing mathematics.
>
> If you have already posted your question on another site, please see our [guidance on cross-posting](https://meta.mathoverflow.net/questions/5012/can-i-ask-a-question-on-mathoverflow-and-also-on-another-site/).
>
> Before you post, [search the site](https://mathoverflow.net/search) to make sure your question hasn’t been answered
> 
> * Summarize the problem
> * Provide details and any research
> * When appropriate, describe what you’ve tried