Bitmead, Robert R.Anderson, Brian D.O.2026-01-022026-01-020098-4094ORCID:/0000-0002-1493-4774/work/174739928https://hdl.handle.net/1885/733803064Suppose a matrix fraction description of a real rational square transfer function matrix is known. A condition is given involving the coefficient matrices in this matrix fraction decomposition which is necessary and sufficient for the transfer function matrix to be lossless positive real.5en197710.1109/TCS.1977.10842700017541953