Why was my (topology) question closed

I don't understand, is the question too trivial? It's always very hard to know whether a question I ask will be well received or not.

Edit: Thank you for the feedback. I have edited my question to reflect the suggestions.

• The selected close reason was "This question is missing context or other details: Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level." Adding some context should get it reopened soon. Dec 3 '15 at 19:20
• @JohnMa the strange thing (to me) is that the question does ask about $M$. I have double checked.. Dec 3 '15 at 19:22