A Chekanov–Eliashberg algebra for Legendrian graphs. Issue 2 (19th March 2020)

• Record Type: Journal Article
• Authors: An, Byung Hee; Bae, Youngjin
• Is Part Of: Journal of topology. Volume 13:Issue 2(2020)
• Page Start: 777
• Page End: 869
• Publication Date: 2020-03-19
• Subjects: 53D42 -- 57R17 (primary) -- 57M15 (secondary); Topology -- Periodicals; 514.05
• DOI: 10.1112/topo.12138
• Languages: English
• ISSNs: 1753-8416

Abstract

Abstract: We define a differential graded algebra for Legendrian graphs and tangles in the standard contact Euclidean three space. This invariant is defined combinatorially by using ideas from Legendrian contact homology. The construction is distinguished from other versions of Legendrian contact algebra by the vertices of Legendrian graphs. A set of countably many generators and a generalized notion of equivalence are introduced for invariance. We show a van Kampen type theorem for the differential graded algebras under the tangle replacement. Our construction recovers many known algebraic constructions of Legendrian links via suitable operations at the vertices.