R. Adin, personal communication (1999).  Home/Search   Document Not in Database   Summary   Related Articles

....with 0. Denote by ffl the tile as above, and by ff ffl (A) the number of times tile ffl occurs in a tiling A. 11 10 01 00 Figure 6.1. Ribbon trominoes. Define 2 moves to be the local moves which involve exactly two ribbon tiles. For description of all such moves see [P] As observed by Adin [Ad], the total number of such moves is Gamma jTn j 2 Delta . This formula is somewhat misleading since not all pairs of ribbon tiles can form a 2 move, while some pairs can form it in several ways. The main object of this section is the successful computation of G (Tn ) and the local move ....

R. Adin, personal communication (1999).

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