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30(I'm on the mathematics advisory board for the arXiv, so I'm quite interested in this question, and very happy to consider other positions. It's certainly something we could think about doing, if it made sense.)– Kim MorrisonCommented Jan 30, 2016 at 5:52
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2'Avoid duplication' is a key point. The DOI wasn't intended to be a unique identifier, but it inevitably gets used as one, and duplicate assignment complicates things.– Andrew is goneCommented Jan 30, 2016 at 11:16
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12@Andrew But the Object represented by the Digital Object Identifier, i.e. the published paper, is not the same Object represented by the arXiv identifier, i.e. the preprint. So "a paper" (really, a preprint and a published paper) having two distinct identifiers is not duplication, it's correct bookkeeping.– user9646Commented Jan 30, 2016 at 15:38
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4@NajibIdrissi this is indeed correct, but if we provide two DOIs people will probably find it tricky to maintain that distinction. Having a separate type of identifier avoids a bit of the confusion.– Andrew is goneCommented Jan 30, 2016 at 16:36
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10To the extent that the preprint and the published paper have distinct identities, remember they already have distinct, globally unique identifiers (an arxiv id and a DOI).– Kim MorrisonCommented Jan 30, 2016 at 21:32
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