L¥ and H¥ Spaces
§H¥- Space: H¥- is a (closed) subspace of L¥ with functions that are analytic and bounded in the open left-half plane. The H¥-  norm is defined as
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• RH¥- : all proper real rational antistable transfer matrices.
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• Examples: H2 functions: 1/s+1, e-hs/s+2, …
• H¥ functions: 5, 1/s+1, 5s+1/s+2, e-hs/s+2, 1/s+1+0.1e-hs, …
• L¥ functions: 5, 1/s+1,1/(s+1)(s-2), 1/s-1+0.1e-hs, …