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Any new text contributed to this wiki is copyrighted automatically (under [http://www.wipo.int/treaties/en/ip/berne/trtdocs_wo001.html the Berne Convention]) by the contributors and is similarly licensed to the public under Creative Commons Attribution-Sharealike 3.0 Unported License (CC-BY-SA).

Any new text contributed to this wiki is copyrighted automatically (under [http://www.wipo.int/treaties/en/ip/berne/trtdocs_wo001.html the Berne Convention]) by the contributors and is similarly licensed to the public under Creative Commons Attribution-Sharealike 3.0 Unported License (CC-BY-SA).

The CC-BY-SA license grants free access to our content in the same sense that [http://en.wikipedia.org/wiki/Free_software free software] is licensed freely. Content can be copied, modified, and redistributed if and only if the copied version is made available on the same terms to others and acknowledgment of the authors of the wiki article used is included (a link back to the article satisfies the attribution requirement). Copied Encyclopedia of Mathematics content will therefore remain free under appropriate license and can continue to be used by anyone subject to certain restrictions, most of which aim to ensure that freedom. This principle is known as copyleft in contrast to typical copyright licenses.

The CC-BY-SA license grants free access to our content in the same sense that [http://en.wikipedia.org/wiki/Free_software free software] is licensed freely. Content can be copied, modified, and redistributed if and only if the copied version is made available on the same terms to others and acknowledgment of the authors of the wiki article used is included (a link back to the article satisfies the attribution requirement). Copied Encyclopedia of Mathematics content will therefore remain free under appropriate license and can continue to be used by anyone subject to certain restrictions, most of which aim to ensure that freedom. This principle is known as copyleft in contrast to typical copyright licenses.