Computable Legendrian invariants
Computable Legendrian invariants
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可计算的传奇不变量
DOI:
10.1016/s0040-9383(02)00010-1
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发表时间:
2000
期刊:
影响因子:
--
通讯作者:
Lenhard L. Ng
中科院分区:
文献类型:
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作者:
Lenhard L. Ng
We establish tools to facilitate the computation and application of the Chekanov–Eliashberg differential graded algebra (DGA), a Legendrian-isotopy invariant of Legendrian knots and links in standard contact three space. More specifically, we reformulate the DGA in terms of front projections, and introduce the characteristic algebra, a new invariant derived from the DGA. We use our techniques to distinguish between several previously indistinguishable Legendrian knots and links.