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Jun 19, 2010 at 18:58 comment added Joel David Hamkins Robin, since this question and the answers seem to tell a complete story, I would recommend simply asking a new question, providing a link in it back to this one, as well as a link above to the new question.
Jun 19, 2010 at 18:42 comment added Robin Saunders Thanks for such a prompt and insight-giving answer. Should I create a new question for the case where the maps are restricted to be injective, or just edit my question above?
Jun 19, 2010 at 3:26 history answered Noah Stein CC BY-SA 2.5