Many questions on this stackexchange are years old (such that the OP probably no longer checks for new answers, no longer needs an answer, or no longer cares). Many of these abandoned questions are so vague or have such an idiosyncratic focus that it would be impossible to judge a "rigorous" answer other than by whether it satisfied the OP (or motivated him to clarify/refine his question).
People occasionally necro these — is the correct policy to vote to close, or to remove, or is there some other option? (I feel in the long-term low-effort, ambiguous questions with no or low-effort answers crowding up the stack will make it unusable, and also when people make minor edits to these - why? - it confuses the "active" queue.)