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- id and arXiv:id - our local internal ids. These are used internally and also quite widely in published literature. They are well recognized by the community. They are not resolvable and not guaranteed to be globally unique. For several years we have been encouraging people to add "arXiv:" as a prefix when printed. This increased the accuracy of pattern matching and is especially important now we have dropped the subject area prefix (i.e. we use arXiv:0808.0001 and not the old arXiv:cs/0610031). There is some discussion at http://arxiv.org/help/arxiv_identifier including the versioning scheme.
- http://arxiv.org/abs/_id_
- this is the canonical link to a spash page. Widely used in web pages, PDF files etc.. URLs with mirror names or old machine names often appear though we discourage (e.g. historical http://xxx.lanl.gov/abs/cs/0610031 which works because this ends up at our mirror http://lanl.arxiv.org/. Because canonical mirror names are in arxiv.org domain we can keep URLs from defunct mirrors working, e.g. [http://za.arxiv.org/abs/cs/0610031)
- http://arxiv.org/(pdf|ps|dvi|e-print|src)/id - canonical links to PS, PostScript, DVI etc. for id. Same issues as with /abs/ links re mirrors.
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