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math.RA2010★ 1 cited
An octonion algebra originating in combinatorics
D. Z. Djokovic, K. Zhao
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 s…
math.RA2002
Solution of the congruence problem for arbitrary hermitian and skew-hermitian matrices over polynomial rings
D. Z. Djokovic, F. Szechtman
We equip the complex polynomial algebra C[t] with the involution which is the identity on C and sends t to -t. Answering a question raised by V.G. Kac, we show that every hermitian…