Although the question is originally about algebras, I do not think that's relevant here. The same thing can be done with any binary operation. Similarly as in bof's answer, I have heard this in connection with groups.
We must have had questions about in the post. But they are probably not easy to find. (Keywords like product or subsets will return many results.)
@DanielFischer I have added at least (binary-operations) and (abstract-algebra) since I think that they fit. If you think that some of the other tags mentioned above would fit the question, feel free to add them.
And it was certainly correct to remove (set-theory).
In connection with this comment I realized that I am not entirely sure how the things work for users below 10k:
Where is the answer then? I should be able to see it, right... I mean I saved it on my computer save a portion I was writing on how sets broke down into tuples. That's not important to me. I can always self-ask a question that is more relevant (since it /is/ intended as what some might call an example of a longer answer). Then, the question will be more worthy of a long winded-answer. I doubt it will be an extremely long answer. Just, longer than usual. Still though, this sounds like a system glitch... — TheGreatDuck8 hours ago
Assuming that a user has a link to his own deleted post:
B) If it is an answer and the question was not deleted, I guess they can see the answer. (Can somebody confirm this? I did not find something on meta.SE about this.)
C) If it is an answer to someone else question and the question was deleted, can the user see their answer? The above comment suggest that the answer is no. Again, I failed to find something in meta.SE saying whether the system should behave in this way.
BTW the answer is deleted now: "This answer was marked as spam or offensive and is therefore not shown." So either some users flagged it as spam. Or I was wrong and "rude or abusive" flags can lead to deletion of a post, too.
Indeed, I was wrong: "How does the Spam flag differ from the Offensive flag? In terms of getting the post deleted, there is no functional difference aside from separate counts - 3/6 of either will be sufficient to delete." meta.stackexchange.com/questions/58032/…
