Meaning of down vote for down voting question

Question

Please see this question.

I down-voted this answer as given the question title and the first line I sincerely believe the answer provided was not correct.

I provided my rationale in an answer.

I note this led to a penalty: enter image description here

I am trying to understand the reason either I can correct my error in understanding, misconception or behavioural breach or other misunderstanding.

I fully accept that the answer I down-voted was instructive in use of ContourPlot3D and I note has received 2 further up-votes. I also note a comment to the answer consistent with my answer, viz. f=0. I will leave my answer but remain uncertain what my error is. — ubpdqn, Apr 11, 2015 at 11:36
One point is subtracted from your rep each time you downvote an answer. That is so mainly to discourage "downvoting wars" among users. — Dr. belisarius, Apr 11, 2015 at 15:52
Anyway, I suggest posting a comment explaining the reasons on the answers you downvote, as courtesy. — Dr. belisarius, Apr 11, 2015 at 15:53
@belisarius thank you for this clarification...I guess I thought my answer was the explanation but not a direct comment...now I have learned policy and will improve my manners — ubpdqn, Apr 11, 2015 at 16:13

Community · Accepted Answer · 2017-03-20 10:29:51Z

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(I am posting as an answer so that this appears answered.)

CommunityBot

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answered Apr 11, 2015 at 16:00

Mr.Wizard

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