#### Vol. 3, No. 2, 2010

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The Gram determinant for plane curves

### Józef H. Przytycki and Xiaoqi Zhu

Vol. 3 (2010), No. 2, 149–169
##### Abstract

We investigate the Gram determinant of the pairing arising from curves in a planar surface, with a focus on the disk with two holes. We prove that the determinant based on $n-1$ curves divides the determinant based on $n$ curves. Motivated by the work on Gram determinants based on curves in a disk and curves in an annulus (Temperley–Lieb algebra of type $A$ and $B$, respectively), we calculate several examples of the Gram determinant based on curves in a disk with two holes, and advance conjectures on the complete factorization of Gram determinants.

##### Keywords
Gram determinants, planar curves, noncrossing partitions, chromatic joins, Temperley–Lieb
##### Mathematical Subject Classification 2000
Primary: 05A99, 57M99