I posted a question about Sage: SageMath: Embed all roots of a polynomial

Now I discovered that there's http://ask.sagemath.org Q&A site with the same format as SE (therefore having the same benefits). Should I repost my question there? And if so, should I delete my question here?

First thing to note is that ask.sagemath.org is powered by AskBot, and is not part of the StackExchange network. Therefore we cannot in fact migrate your question there for you. In general I would prefer that the usual rules about "please don't cross post" apply more broadly on the internet; but that's just me.