Should a paper of exactly 15 pages be submitted to Transactions or Proceedings of the AMS? I would like to submit a paper which is exactly 15 pages. The journal overview of Transactions of the AMS says:


  Papers of less than 15 printed pages that meet the above criteria should be submitted to the Proceedings of the American Mathematical Society.


It seems that my paper can be submitted to Transactions, since it is exactly 15 pages. However, Initial Submission for Peer Review of Transactions of the AMS says:


  Papers submitted to Transactions of the AMS (to be published in either Transactions of the AMS or Transactions of the AMS, Series B) should exceed 15 printed pages in length."


So it seems that my paper cannot be submitted to Transactions (since it is exactly 15 pages), and should be submitted to Proceedings. So I am confused. Does anyone have information/similar experience which could possibly let me know to which journal I should submit?
You should submit your paper to Proceedings.

The overview page for Proceedings of the AMS clarifies this:


  This journal is devoted to shorter research articles (not to exceed 15 printed pages) in all areas of pure and applied mathematics.


If your article is exactly 15 pages long (or less), then its length does not exceed 15 pages, and so it is suitable for submission to Proceedings.  By that same token, it is not suitable for submission to Transactions.  The intention is clearly that the criteria should be mutually exclusive.

Information on a journal's own web page should be considered more authoritative than information about that journal on a different journal's web page.