Hi, I'm relatively new here and I have two questions, one on a specific situation and another one on etiquette:
While I was typing an answer to this question somebody else posted an answer containing only a hint (which I could not make much sense of and which has been deleted in the meantime). Since my original answer gave away a complete solution, I decided to delete my answer and to post another answer containing only a sketch of the argument. I think this sketch should enable a reasonably motivated student to complete the argument but it is not entirely trivial. The idea was to let the student try a little harder and if he comes back and has further questions, I was eventually going to unveil the complete solution. Is this a viable option? The main obstruction is of course how long my deleted answer will persist.
My second question is on etiquette. Is it more common only to hint at a solution rather than giving a complete answer?