They are topics in theoretical computer science so they are on-topic here. If you think your question may receive a more suitable answer here feel free to ask moderators on Math.SE to migrate them.
If the question is not yours then the issue is more complicated. The question would be on-topic here but migrating a question is a decision that should be made by Math.SE. Please see this meta discussion on their meta for more information.
One thing you can do is that if you are interested in a question and the answers on Math.SE do not answer your question in a satisfactory way you can post a new follow up question here linking to that question and pointing out more specifically why you feel the answers are not satisfactory.