Document Type

Article

Publication Date

12-2010

Department

Mathematics

Abstract

C.H. Yang discovered a polynomial version of the classical Lagrange identity expressing the product of two sums of four squares as another sum of four squares. He used it to give short proofs of some important theorems on composition of δ-codes (now known as T-sequences). We investigate the possible new versions of his polynomial Lagrange identity. Our main result shows that all such identities are equivalent to each other.

Comments

This article was originally published in Proceedings of the American Mathematical Society, 138(12): 4187-4195. (c) 2010 American Mathematical Society

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