<p>I asked a question about a derivation once, and someone supplied an answer to it. Soon after, the question was closed, however, but I was still discussing and referring to that person's answer there. Now I can't seem to find that question in my list of questions asked, or whenI search words from its title.</p>
<p>Has the question disappeared because closed questions are eventually deleted by moderators? If so, how many days between time of closed to time of deletion?</p>
