<p>Caveat lector.</p>
<p>If you have some time to spare, please consider visiting the Mathematics StackExchange chatroom: <a href="http://chat.stackexchange.com/rooms/9141/the-crusade-of-answers">Crusade of Answers</a>. We mostly post community-wiki answers to old unanswered questions.</p>
<p>If you find that your more than one year old answer just got a fresh upvote, it is possibly that the crusaders are using <a href="http://data.stackexchange.com/mathematics/query/119994/zero-score-answers-to-unanswered-questions-by-tag" rel="nofollow noreferrer">this data explorer query</a> finding your answer deserves an upvote.</p>

Shuhao Cao