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There was a post on m.se a few days ago, I want to say Thursday or Friday night (SEpt 17th or 18th 2015) where a user was asking for help showing some propositional logic result without using truth tables. It was pretty similar to this question but the proposition in question was a little more complex with a bunch of nested implications. Something like $((p\vee q)\rightarrow r)\wedge((\neg p\vee s)\rightarrow t)\rightarrow q\wedge s$. That's not right, clearly, but it was something like that. And then the user lists that he's allowed to use the identities $p\vee T=T$, $p\wedge F=F$, etc.

I've been searching for the post with no success, and I presume it's been deleted. Is it easy for someone with high privileges to find such things and share them?

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  • $\begingroup$ Users, except for moderators, can't search for deleted posts. Try looking through your browser history. $\endgroup$ – user147263 Sep 20 '15 at 4:15
  • $\begingroup$ @NormalHuman, yeah, that's a good idea. I scoured browser history with no success. which leads me to conclude I must've viewed it in the iOS app. Or dreamed it. Do moderators ever field requests like this? $\endgroup$ – ziggurism Sep 20 '15 at 4:50
  • $\begingroup$ They do sometimes. It might help to explain why you need that question; the author could have had a reason to delete it, after all. $\endgroup$ – user147263 Sep 20 '15 at 4:56
  • $\begingroup$ @NormalHuman: Oh I just really wanted to work the problem. I wasn't at leisure to do so when I first saw it. Now when I'm available to go back, the post is missing. Frustrating, though perhaps not a compelling reason for a moderator to circumvent site functionality? $\endgroup$ – ziggurism Sep 20 '15 at 5:02
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    $\begingroup$ @Joe It doesn't help for this particular instance, but marking the question as favorite and/or bookmarking its page are good ways to keep track. Now a favorite gets hidden when it is deleted, so bookmarking is the only real safeguard to questions getting lost. $\endgroup$ – Lord_Farin Sep 20 '15 at 10:15

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