Allow problems concerning spectral properties of patterns
Allow problems concerning spectral properties of patterns
Let S � {0,+, ,+0, 0,�,#} be a set of symbols, where + (resp., , +0 and 0) denotes a positive (resp., negative, nonnegative and nonpositive) real number, and � (resp., #) denotes a nonzero (resp., arbitrary) real number. An S-pattern is a matrix with entries in S. In particular, …