Reconstructions of Special Sequences 1 Yatsuka

We discuss here some methods for reconstructing special sequences which generate special polygonal arcs in E2 T. For such reconstructions we introduce a “mid” function which cuts out the middle part of a sequence; the “ ” function, which cuts down the left part of a sequence at some point; the “ ” function for cutting down the right part at some point; and the “ ” function for cutting down both sides at two given points. We also introduce some methods glueing two special sequences. By such cutting and glueing methods, the speciality of sequences (generatability of special polygonal arcs) is shown to be preserved.