# Serial down-voting [duplicate]

I answered three question a while back, and today when I logged-in I see they were all voted down in chronological order. In fact one of my answers was even accepted by OP.

proof that $$A \triangle (B \triangle C) = (A \triangle B) \triangle C$$

what is the cardinality of $$\{n^{1/k}: n, k\in \mathbb{N}\}$$?

Prove that if $$T:U \to V$$ is an isomorphism and $$\dim_F (V)=n\in \mathbb{N}$$, show that $$\dim_F(U)=n\in \mathbb{N}$$

Were my answers deficient? As far as I know, they are all rigorous. Are there criteria for downvoting answers, like there are for questions? Were my answers not on par with the criteria?

Regards!

• No. Yes there is a criteria, if the answer is not useful then you should downvote,though this not your case because obviously your answers are fine, useful an even one accepted :) so don't worry about it.. – user486983 Dec 1 '18 at 2:23
• @Isah Thanks for the assurance! XD as long as the answers are correct I am happy. Regards. – Bertrand Wittgenstein's Ghost Dec 1 '18 at 2:38
• Allow me a nitpick: "criterion" is the singular form of "criteria." You can say "Is there a criterion?" or "Are there criteria?" – Cheerful Parsnip Dec 2 '18 at 3:50
• @CheerfulParsnip meh, I had a C in english. Don't criticize my english. Jk. Lol. – Bertrand Wittgenstein's Ghost Dec 2 '18 at 3:52
• @CheerfulParsnip whichever seems to fit the question, I guess. – Bertrand Wittgenstein's Ghost Dec 2 '18 at 3:52
• See also: (1), (2), and (3). Other related topics can be found by searching. – Xander Henderson Mod Dec 2 '18 at 6:05
• I briefly looked at the second of the linked answers. There were significant issues (symbols that made no sense as written, unexplained notation and so on). Meaning: even if superficially an answer appears correct, it may well still be lacking in quality, which may attract downvotes. – Andrés E. Caicedo Dec 2 '18 at 13:51
• In the future, when you notice you've received a handful or more of downvotes in a very short period of time, the best course of action is to flag one of the affected posts, indicating the flag is for moderator attention, and explain the recent influx of downvotes on $n$ of your questions. You can also check out the moderator's chat room and talk with a mod their, but flagging will be more expedient. The mod's then can view your reputation top in your profile to find the other occurrences. Please do not post to meta.math.se every time you think you're a the victim of serial voting. – amWhy Dec 2 '18 at 18:03
• I now looked also at the third of your linked answers, and the whole beginning of it is wrong as well. – Andrés E. Caicedo Dec 2 '18 at 19:33
• @AndrésE.Caicedo That is not my answer, that was Op's proof which i told him was wrong. – Bertrand Wittgenstein's Ghost Dec 2 '18 at 20:55
• @amWhy Ok, thanks for that! – Bertrand Wittgenstein's Ghost Dec 2 '18 at 20:55
• @AndrésE.Caicedo My proof starts at the very end. – Bertrand Wittgenstein's Ghost Dec 2 '18 at 20:56
• @Bertrand Hehe. Sure. – Andrés E. Caicedo Dec 2 '18 at 20:57
• @AndrésE.Caicedo dude, did you even read my answer? The first part is just telling Op why their proof is wrong. – Bertrand Wittgenstein's Ghost Dec 2 '18 at 20:58
• @AndrésE.Caicedo I don't get it, what is the point of this comment? – Bertrand Wittgenstein's Ghost Dec 2 '18 at 21:29