Open Access
Winter 2018 Almost Hadamard matrices with complex entries
Teodor Banica, Ion Nechita
Adv. Oper. Theory 3(1): 137-177 (Winter 2018). DOI: 10.22034/aot.1702-1114
Abstract

We discuss an extension of the almost Hadamard matrix formalism, to the case of complex matrices. Quite surprisingly, the situation here is very different from the one in the real case, and our conjectural conclusion is that there should be no such matrices, besides the usual Hadamard ones. We verify this conjecture in a number of situations, and notably for most of the known examples of real almost Hadamard matrices, and for some of their complex extensions. We discuss as well some potential applications of our conjecture, to the general study of complex Hadamard matrices.

Copyright © 2018 Tusi Mathematical Research Group
Teodor Banica and Ion Nechita "Almost Hadamard matrices with complex entries," Advances in Operator Theory 3(1), 137-177, (Winter 2018). https://doi.org/10.22034/aot.1702-1114
Received: 9 February 2017; Accepted: 12 May 2017; Published: Winter 2018
Vol.3 • No. 1 • Winter 2018
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