There is no Hadamard circulant matrices H of order n > 4 with (a) first
column [x1; : : : ; xn]
where x1(xi + x n
2 +i) > 2
for all i = 1; : : : ; n=2 and (b)
such that A + B is symmetric, where A; B are matrices of order n=2 such that
the first n/2 lines of H have the form [A; B].