منابع مشابه
Drifting Continents and Late Paleozoic Geography* by P. J. Darlington, Jr
As a result of 19 months spent in Tasmania and eastern Australia and 7 weeks at the southern tip of South America, followed by a year of reading and writing on the biogeography and history of the southern end of the world, I have gradually become convinced that continental drift is not just an intellectual exercise but a probable reality. I was not easily convinced of this. I am a conservative,...
متن کاملMinimal symmetric Darlington synthesis
We consider the symmetric Darlington synthesis of a p × p rational symmetric Schur function S with the constraint that the extension is of size 2p×2p. Under the assumption that S is strictly contractive in at least one point of the imaginary axis, we determine the minimal McMillan degree of the extension. In particular, we show that it is generically given by the number of zeros of odd multipli...
متن کاملLinear Time-varying Darlington Synthesis
Given a contractive linear system T which is represented as a causal linear operator on a Hilbert space H. We study the question: when does there exist an isometric or unitary causal extension of T to H⊕H?
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Let T be a block lower triangular contraction, i.e., a contractive operator T = (ti,j) ∞ i,j=−∞ acting from a doubly infinite Hilbert space direct sum ⊕∞ j=−∞Kj into a doubly infinite Hilbert space direct sum ⊕∞ j=−∞ Lj . The operator ti,j , which maps Kj into Li, is the (i, j)-th entry in the operator matrix representation of T relative to the natural Hilbert space direct sum decompositions. I...
متن کاملMinimal symmetric Darlington synthesis: the real case
We consider the symmetric Darlington synthesis of a p × p rational symmetric Schur function S with the constraint that the extension is of size 2p × 2p and we investigate what happens when we impose that S and its extension have real coefficients. In this case, under the assumption that S is strictly contractive in at least one point of the imaginary axis, we determine the an upper bound for th...
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ژورنال
عنوان ژورنال: Psyche: A Journal of Entomology
سال: 1983
ISSN: 0033-2615,1687-7438
DOI: 10.1155/1983/91531