“…However, it would require the addition of O(p) extra edges to move the head of the zipper, and then evaluating the resulting sum for large p. Instead we found it more convenient to start from (3.7) and the integral representation (A.1) of the Green function. The calculation essentially follows the same steps as the corresponding one on the square lattice, made explicit in [33]. We therefore skip the details and give the final result in a case that is relevant to (A.7), namely G ′ (0,0),(p,2p+1) = G 0,0 − (0, 0) (1, 0) (1, 1) (0, 1) (0, 0) 0 − 2 3 G0,0+ 7 Table 5: Values of the Green function derivative of the triangular lattice around the origin, with respect to the zipper shown in panel (a) of Fig.…”