期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2014
卷号：111
期号：27
页码：9725-9732
DOI：10.1073/pnas.1313070111
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：We show that the twisted SL2 skein algebra of a surface has a natural basis (the bracelets basis) that is positive, in the sense that the structure constants for multiplication are positive integers.
