§H2 Space: a (closed) subspace of L2(jR) with functions F(s) analytic in Re(s) > 0.
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• RH2 (real rational subspace of H2 ): all strictly proper and real rational stable transfer matrices.
§H2^ Space: the orthogonal complement of H2 in L2, i.e., the (closed) subspace of functions in L2 that are analytic in Re(s)<0.
§ RH2^ ( the real rational subspace of H2^ ): all strictly proper rational antistable transfer matrices.
§Parseval’s relations: (between time domain and frequency domain)
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