5:46 AM
[ SmokeDetector ] Repeating characters in body: How to determine if a sparse matrix is structurally symmetric by El Bee on `math.stackexchange.com`

I just flagged this a duplicate. Let me know if you agree since I can retract my vote if it isn't the case.

10 hours later…
3:45 PM
@dustin It's closed now, and I voted to close before even seeing your message here. Typically, people who disagree with a duplicate call will leave a comment under the question, because it pings the first voter and informs the other ones.

3 hours later…

7:05 PM
@FamousBlueRaincoat I really like the dear part. Do they know the are addressing a math forum?

7:58 PM
[ SmokeDetector ] Phone number detected: Find the \$r^{th}\$ term of the series \$1234567891011121314\\cdots \$ by R K on `math.stackexchange.com`