When I saw the question “What is the most efficient algorithm to sample graphs with trivial automorphism groups ?” by turkistany, it reminded me that I saw a similar question recently, but it was difficult to find which question it was. It turned out that the “similar” question was “Generating Graphs with Trivial Automorphisms” by Sadeq (which was indeed related, but was not similar after all).

Part of the difficulty of finding this question was due to the fact that the former had a tag [automorphism] while the latter had [graph-isomorphism], which rendered tag search useless. (Of course part of the difficulty is due to my poor searching skill.)

At this moment, there are five questions with the tag [automorphism], and all of them seem to be about the automorphisms of a graph. Considering that graph isomorphisms and graph automorphisms are obviously very closely related, it makes some sense to merge these tags, which would have avoided the difficulty I encountered.

However, converting [automorphism] into a tag synonym of [graph-isomorphism] does not sound right for the future use.

Converting both tags into a tag synonym of a new tag [isomorphism] is another option. However, [isomorphism] is a little vague, and it can refer to the isomorphisms between languages as in the Berman-Hartmanis isomorphism conjecture for example.

Leaving these tags as they are is also a valid option.

What should we do about these tags?

  • $\begingroup$ yes, I was wondering about that too. I don't have a good solution either and was inclined to leave things as they are. We could edit the tag wiki to indicate that they are related, for what it's worth $\endgroup$ Oct 13, 2010 at 15:13
  • $\begingroup$ This is something perhaps worth revisiting when there has been more use of these tags? $\endgroup$ Oct 13, 2010 at 16:11
  • $\begingroup$ @Suresh: the tag wiki idea sounds good, but may have to wait until these tags have been used more. One needs 1500 reputation to edit a tag wiki and a lot of reputation/experience with the specific tag for which one wants to edit the wiki. Do your superpowers override this? $\endgroup$ Oct 13, 2010 at 16:14
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    $\begingroup$ he he. I can do ANYTHING. $\endgroup$ Oct 13, 2010 at 18:20
  • $\begingroup$ @Suresh: Tag wiki will not hurt. I agree that that is the best thing to do as far as I know. Unfortunately I am not sure how much it helps, though. $\endgroup$ Oct 13, 2010 at 18:51
  • $\begingroup$ @András: Just in case, the condition for editing tag wiki (for those without Awesome Moderator Powers (TM)) is [you have rep points ≥ 1500] and [either you are among top 20 answerers for this tag or the sum of votes to your answers for this tag is ≥ +100]. Currently, it seems that an answer with positive score is almost always enough to let you enter among the top 20 for that tag except for a few very common tags. $\endgroup$ Oct 13, 2010 at 18:54


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