I am not new here. Well... I see here some questions in "unanswered" category that have gained many votes but are unanswered yet. As far as I know, the site has many outspoken members viz., some them are mathematicians, engineers etc. So how is it possible that no answer is given yet? Do these questions need research work? Are they just new in field of mathematics? Or, people ignore it? Or answers are being found?