Topics in Interpolation Theory of Rational Matrix-valued Functions Paperback / softback
by I. Gohberg
Part of the Operator Theory: Advances and Applications series
Paperback / softback
Description
One of the basic interpolation problems from our point of view is the problem of building a scalar rational function if its poles and zeros with their multiplicities are given.
If one assurnes that the function does not have a pole or a zero at infinity, the formula which solves this problem is (1) where Zl , " " Z/ are the given zeros with given multiplicates nl, " " n / and Wb" " W are the given p poles with given multiplicities ml, . . . ,m , and a is an arbitrary nonzero number. p An obvious necessary and sufficient condition for solvability of this simplest Interpolation pr- lern is that Zj :f: wk(1~ j ~ 1, 1~ k~ p) and nl +. . . +n/ = ml +. . . +m ' p The second problem of interpolation in which we are interested is to build a rational matrix function via its zeros which on the imaginary line has modulus 1.
In the case the function is scalar, the formula which solves this problem is a Blaschke product, namely z z. )mi n u(z) = all = l~ (2) J ( Z+ Zj where [o] = 1, and the zj's are the given zeros with given multiplicities mj.
Here the necessary and sufficient condition for existence of such u(z) is that zp :f: - Zq for 1~ ]1, q~ n.
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Item not Available
- Format:Paperback / softback
- Pages:247 pages, IX, 247 p.
- Publisher:Springer Basel
- Publication Date:11/09/2013
- Category:
- ISBN:9783034854719
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Information
-
Item not Available
- Format:Paperback / softback
- Pages:247 pages, IX, 247 p.
- Publisher:Springer Basel
- Publication Date:11/09/2013
- Category:
- ISBN:9783034854719
