Abstract
Finite convolution operators are studied by means of a complex Fourier transform technique. Questions concerning unicellularity and similarity are related to asymptotic properties of bounded analytic functions in a half-plane. The purpose of the paper is to survey recent work, and to call attention to open problems. The theory is illustrated by a list of examples.
Research supported by NSF Grants MCS 76–06297 and MCS 75–04594.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
M.S. Brodskiǐ, On a problem of I.M. Ge’fand. Uspehi Mat. Nauk 12 (1957), no. 2 (74), 129–132. (Russian) MR 20 #1229.
M.S. Brodskiǐ, On the unicellularity of the integration operator and a theorem of Titchmarsh. Uspehi Mat. Nauk 20 (1965), no. 5 (125), 189–192. (Russian) MR 32 #8055.
M.S. Brodskiǐ, Triangular and Jordan Representations of Linear Operators. Moscow, 1969. Transi. Math., Monographs, Vol. 32, Amer. Math. Soc., Providence, R.I., 1970.
V.W. Daniel, Invariant subspaces of convolution operators. Dissertation, University of Virginia, 1970.
W.F. Donoghue, Jr., The lattice of invariant subspaces of a completely continuous quasi-nilpotent transformation. Pacific J. Math. 7 (1957), 1031–1036. MR 19# 1066.
C. Foiaş and W. Mlak, The extended spectrum of completely non-unitary contractions and the spectral mapping theorem. Studia Math. 26 (1966), 239–245. MR 34 #610.
C. Foiaş and J.F. Williams, Some remarks on the Volterra operator. Proc. Amer. Math. Soc. 31 (1972), 177–184. MR 45 #4194.
R. Frankfurt, Spectral analysis of finite convolution operators. Trans. Amer. Math. Soc. 214 (1975), 279–301.
R. Frankfurt, On the unicellularity of finite convolution operators. Indiana Univ. Math. J. 26 (1977), 223–232.
R. Frankfurt and J. Rovnyak, Finite convolution operators. J. Math. Anal. Appl. 49 (1975), 347–374. MR 51 #3947.
J.M. Freeman, Volterra operators similar to J: \( f\left( x \right) \to \int\limits_0^x {f\left( y \right)} \;dy \). Trans. Amer. Math. Soc. 116 (1965), 181–192. MR 33 #592.
P.A. Fuhrman, On the corona theorem and its application to spectral problems in Hilbert space. Trans. Amer. Math. Soc. 132 (1968), 55–56. MR 36 #5751.
P.A. Fuhrman, A functional calculus in Hilbert space based on operator valued analytic functions. Israel J. Math. 6 (1968), 267–278. MR 38 #5029.
J.I. Ginsberg and D.J. Newman, Generators of certain radical algebras. J. Approximation Theory 3 (1970), 229–235. MR 41# 9014.
I.C. Gohberg and M.G. Kreǐn, Theory and Applications of Volterra Operators in Hilbert Space. Moscow, 1967. Transi. Math. Monographs, Vol. 24, Amer. Math. Soc, Providence, R.I., 1970. MR 36 #2007.
E. Hille and R.S. Phillips, Functional Analysis and Semi-Groups. Amer. Math. Soc. Coll. Publ., Vol XXXI, Providence, 1957.
G.K. Kalisch, On similarity, reducing manifolds, and unitary equivalence of certain Volterra operators. Ann. of Math. 66 (1957), 481–494. MR 19 # 970.
G.K. Kalisch, On similarity invariants of certain operators in Lp. Pacific J. Math. 11 (1961), 247–252. MR 22# 11261.
G.K. Kalisch, A functional analytic proof of Titchmarsh’s convolution theorem. J. Math. Anal. Appl. 5 (1962), 176–183. MR 25 #43U7.
G.K. Kalisch, Théorème de Titchmarsh sur la convolution et opérateurs de Volterra. Séminaire d’Analyse, dirigé par P. Lelong, 1962/63, no. 5, 6 pp. Secretariat mathematique, Paris, 1963. MR 31 #6123.
G.K. Kalisch, On fractional integrals of pure imaginary order in Lp. Proc. Amer. Math. Soc. 18 (1967), 136–139. MR 35 #7145.
I.I. Kal’muševskiǐ, On the linear equivalence of Volterra operators. Uspehi Mat. Nauk 20 (1965), no. 6 (126), 93–97. MR 32 #8161; errata, MR 46, p. 2168.
I.I. Kal’muševskiǐ, On a certain class of mutually non-equivalent Volterra operators. (Russian) Ukrain. Mat. Ž. 18 (1966), no. 3, 116–119. MR 33 #1678.
G.E. Kisilevskiǐ, Invariant subspaces of dissipative Volterra operators with nuclear imaginary components. Izv. Akad. Nauk SSSR Ser. Mat. 32 (1968), 3–23. Math. USSR-Izv. 2 (1968), 1–20. MR 36 #4375.
H. Kober, On a theorem of Schur and on fractional integrals of purely imaginary order. Trans. Amer. Math. Soc. 50 (1941), 160–174. MR 3, 39.
M.M. Malamud, Sufficient conditions for the linear equivalence of Volterra operators.Teor. Funkciǐ Funkcional. Anal. i Prilozen. Vyp. 23 (1975), 59–69, 170 (Russian). MR 53 #3799.
M.M. Malamud and E.R. Cekanovskiǐ, Tests for the linear equivalence of Volterra operators in the L p scale. Uspehi Mat. Nauk 30 (1975), no. 5 (185), 217–218 (Russian). MR 33# 3800.
P.S. Muhly, Compact operators in the commutant of a contraction. J. Functional Analysis 8 (1971), 197–224. MR 47 # 4035.
H. Radjavi and P. Rosenthal, Invariant Subspaces. Springer-Verlag, New York, 1973.
L.A. Sahnovič, Spectral analysis of Volterra operators and inverse problems. Dokl. Akad. Nauk SSSR 115, no. 4 (1957), 666–669. (Russian) MR 19 # 866.
L.A. Sahnovič, On reduction of Volterra operators to the simplest form and on inverse problems. Izv. Akad. Nauk SSSR Ser. Mat. 21 (1957), 235–262. MR 19 # 970.
L.A. Sahnovič, Reduction of a non-selfadjoint operator with continuous spectrum to diagonal form. Uspehi Mat. Nauk 13 (1958), no. 4 (42), 193–196. (Russian) MR 20 # 7222.
L.A. Sahnovič, Spectral analysis of operators of the form \( Kf= \int\limits_0^x {f\left( t \right)k\left( {x - t} \right)} \;dt \). Izv. Akad. Nauk SSSR 22 (1958), 299–308. MR 20# 5409.
L.A. Sahnovič, Spectral analysis of Volterra operators prescribed in the vector-function space L m2 (0,l), Ukrain. Mat. Ž. 16 (1964), 259–268.
L.A. Sahnovič, Spectral analysis of Volterra operators prescribed in the vector-function space L m2 (0,l), Amer. Math. Soc. Transi. (2) 61 (1967), 85–95. MR 29 # 2680.
L.A. Sahnovič, Dissipative Volterra operators. Mat. Sb. 76 (118) (1968), 323–343. Math. USSR Sb. 5 (1968), 311–331. MR 37 # 3389.
D. Sarason, A remark on the Volterra operator. J. Math. Anal. Appl. 12 (1965), 244–246. MR 33 # 580.
D. Sarason, Weak-star generators of H∞. Pacific J. Math. 17 (1966), 519–528. MR 35# 2151.
D. Sarason, Generalized interpolation in H∞. Trans. Amer. Math. Soc. 127 (1967), 179–203. MR 34 # 8193.
B. Sz.-Nagy and C. Foiaş, Harmonic Analysis of Operators on Hilbert Space. North Holland, New York, 1970.
V. Volterra, Theory of Functionals. Dover, New York, 1959.
V. Volterra and J. Pérès, Leçons sur la Composition et les Fonctions Permutables. Gauthier-Villars, Paris, 1924.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1978 Birkhäuser Verlag Basel
About this chapter
Cite this chapter
Frankfurt, R., Rovnyak, J. (1978). Recent Results and Unsolved Problems on Finite Convolution Operators. In: Butzer, P.L., Szökefalvi-Nagy, B. (eds) Linear Spaces and Approximation / Lineare Räume und Approximation. International Series of Numerical Mathematics / Intermationale Schriftenreihe zur Numberischen Mathematik / Sùrie Internationale D’analyse Numùruque, vol 40. Birkhäuser Basel. https://doi.org/10.1007/978-3-0348-7180-8_13
Download citation
DOI: https://doi.org/10.1007/978-3-0348-7180-8_13
Publisher Name: Birkhäuser Basel
Print ISBN: 978-3-7643-0979-4
Online ISBN: 978-3-0348-7180-8
eBook Packages: Springer Book Archive