# Should I delete this question?

Today I asked the following question here:

Domain of multiplication operator

As it turned out, it was a foolish question on my part. I had made a silly mistake. Should I delete it now because future readers will waste their time in reading that only to find out that it was no good?

But somehow, deleting it feels unjust to those who took time to answer and comment.

What should be done with this question?

• You cannot delete it as it has an answer with positive score. – Tobias Kildetoft Aug 2 '14 at 18:05
• Incidentally, I upvoted the answer. so I could remove it and still delete. – Vishal Gupta Aug 2 '14 at 18:11
• Not unless you upvoted less than 5 minutes ago (or edit the answer). Instead, just add a short sentence to the start of the question indicating your misunderstanding. – Tobias Kildetoft Aug 2 '14 at 18:13
• Minor comment: TeX-style'' quotation marks don't look good here. Better to use the "normal" quotation marks. – user147263 Aug 2 '14 at 19:03

In his book, Linear Operators on Hilbert Spaces'', Weidmann claims (on Page 52, Example 2)