Περίληψη:
Base sequences of lengths n + 1, n + 1, n, n are constructed for all decompositions of 4/1 + 2 into four squares for n = 19,., 24. The construction is achieved through an algorithm which is also presented. It is proved through an exhaustive search that Turyn sequences do not exist for n = 18,., 27; since Turyn sequences cannot exist for n = 28 or 29, the first unsettled case is n = 30. © 1990 American Mathematical Society.
Συγγραφείς:
Koukouvinos, C.
Kounias, S.
Sotirakoglou, K.
