Lagrange identity for polynomials and 𝛿-codes of lengths 7𝑡 and 13𝑡
C. H. Yang · Proceedings of the American Mathematical Society · 1983
It is known that application of the Lagrange identity for polynomials (see [ 1 ]) is the key to composing four-symbol δ \delta -codes of length ( 2 s + 1 ) t (2s + 1)t for s = 2 a 10 b 26 c s = {2^a}{10^b}{26^c} and odd t ⩽ 59 t \leqslant 59 or t = 2 d 10 e 26 f + 1 t = {2^d}{10^e}{26^f} + 1 , where a a , b b , c c , d d , e e and f f are nonnegative integers. Applications of the Lagrange identity also lead to constructions of four-symbol δ \delta -codes of length u u for u =