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In Kaplansky's Set Theory & Metric Spaces, there is a section containing 19 exercises on Functions. The first two exercises describe one-to-one and onto properties. Can I make a community wiki page in this Q&A style?

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  • $\begingroup$ Related (to the general idea): [Views on asking and answering questions solely to make results available on stack exchange.] $\endgroup$ – Martin Sleziak Sep 24 '13 at 16:29
  • $\begingroup$ As far as this specific suggestion is concerned, some of them might already have answers here. For example one of those exercises is about composition of two surjective map; see here or here. $\endgroup$ – Martin Sleziak Sep 24 '13 at 16:30
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It is no longer possible to ask Community Wiki questions: see the StackExchange blog post The Future of Community Wiki:

Community Wiki is primarily for Answers

If we haven’t said this enough already, questions rarely, if ever, need community wiki. What about answers? We removed the ability for users to make a question community wiki, but left the ability for users to make an answer wiki.

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Community wiki is for that rare gem of a post that needs true community collaboration. That’s when community wiki shines. If your site is teeming with community wiki posts — particularly in questions — you should consider the above points carefully.


That said, even if it were possible, I think it's a bad idea to ask 19 questions at once (whether in a single post or not). I suggest you ask a single question, learn from it, then ask another question if necessary.

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    $\begingroup$ Does that mean we have to start closing soft questions with no correct answer? $\endgroup$ – mrf Sep 24 '13 at 21:09
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    $\begingroup$ Although it is true, that you cannot make a question community wiki when posting, the standard procedure is to flag the question for moderators' attention and ask them to convert it to CW, see CW FAQ. $\endgroup$ – Martin Sleziak Sep 25 '13 at 6:41
  • $\begingroup$ Hm, I didn't know CW on questions was intended to be used so sparingly. Good to know this convention. $\endgroup$ – rschwieb Sep 25 '13 at 16:13

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