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Course Information
Costel Peligrad
Professor
610A Old Chemistry Building
513-556-4071
costel.peligrad@uc.edu
Research Support
Taft Travel Grant, Funded 2003
Taft Travel Grant, Funded 1998
Taft Research Travel Grant, Funded 1995
Taft Research Travel Grant, Funded 1993
Taft Travel Grant, Funded 1990
Taft Research Grant, Funded 1989
Taft Travel Grant, Funded 1987
NSF Grant, Funded 1985 to 1987.
Romanian Academy Prize, Funded 1981
Peer Reviewed Publications
(2004). Reflexivity of strictly cyclic operator algebras. Integral Equations and Operator Theory, 48, 557-560.
Gootman, E., & Lazar, A. (1994). Spectra for compact group actions. J. Operator Theory, 31, 381-399.
Szymanski, W. (1994). Saturated actions of Hopf algebras on C*-algebras. Math Scandinavica, 75, 217-239.
(1992). Compact actions commuting with ergodic actions and applications to cross-products. Trans. Amer. Math. Soc., 331, 825-836.
Osterburg, J. (1991). A strong Connes spectrum for finite group actions of simple rings. Journal of Algebra, 142, 424-434.
(1990). Duality and ergodic actions of simple Lie groups on operator algebras. Rocky Mountain J. Math., 29, 503-510.
(1990). A remark on invariant operator ranges. Journ. Int. Eq. and Operator Theory, 13, 145-147.
(1988). Locally compact group actions on C*-algebras and compact subgroups. J. Func. Analysis, 76, 126-140.
(1986). Compact derivations of nest algebras. Proc. AMS, 97, 668-672.
Goodman, F., & Jorgensen, Palle (1986). Smooth derivations commuting with Lie group actions. Math. Proc. Cambridge Phil. Soc., 99, 307-314.
Rubenstein, S. (1984). Maximal subalgebras of C*-crossed products. Pacific J. Math., 110, 325-335.
Longo, R. (1984). Non-commutative topological dynamics and compact actions on C*-algebras. J. Func. Anal., 58, 157-174.
(1982). Derivations of C*-algebras which are invariant under an automorphism group II. Birkhauser Verlag, 6.
(1981). Derivations of C*-algebras which are invariant under an automorphism group. Birkhauser Verlag, 2.
Christensen, E. (1980). Commutants of nest algebras modulo the compact operators. Invent. Math., 56, 113-116.
(1980). Reflexive operator algebras on non-commutative Hardy spaces. Math. Ann., 2253, 165-175.
(1979). Invariant subspaces of von Neumann algebras II. Proc. Amer. Math. Soc., 73, 346-350.
(1979). On operators with reductive commutant and commutants of reductive operators. Rev. Roum. Math. Pures et Appl., 24, 153-159.
(1978). Derivations of nest algebras with values in K(H). INCREST, 16.
(1975). Invariant subspaces of von Neumann algebras. Acta Sci. Math., 37, 273-277.
(1974). On some transitive algebras. Rev. Roum. Math. Pures et Appl., 19, 245-250.
(1974). Reductive algebras which contain n-strictly cyclic algebras. Rev. Roum. Math. Pures et Appl., 19, 1041-1042.
(1974). Remarks on a theorem by R. G. Douglas and C. Pearcy. Rev. Roum. Math. Pure et Appl., 20, 1041-1043.
Zsido, L. (1973). A Riesz decomposition theorem in W*-algebras. Acta. Sci. Math., 34, 317-322.
Other Publications
Dumitru, Raluca, & Visinescu, Bogdan (2006). Automorphisms inner in the local multiplier algebra and Connes spectrum. Proceedings of the 20-th Conference in Operator Theory 75-81. Timisoara, Romania.
Zsido, L. (2000). Open projections of C*-algebras: Comparison and regularity. Proceedings of the 17th OT Conference 285 - 300. Timisoara, Romania.
(1991). Crossed product C*-algebras by compact group actions vs. fixed point algebras. Proceedings of GPOTS 93-97. Indianapolis, IN.
(1990). Actions of compact groups on C*-algebras. Proceedings of Symposia in Pure Mathematics, Operator Theory/Operator Algebras, 51, 243-246.
Invited Presentations
(03-2005). Unbounded derivations commuting with compact quantum group actions. University of Rome, Tor Vergata.
(2004). Maximal sub-algebras associated with C*-dynamical systems. 20th Conference on Operator Theory, Timisoara, Romania.
(08-2003). Comparison of hereditary subalgebras of C*-algebras. UPR, Rio Piedras, Puerto Rico.
(06-1998). Open projections of C*-algebras. Timisoara, Romania.
(04-1997). A comparison of open projections. Univ. of Puerto Rico
(03-1997). Strongly prime C*-algebras. Univ. of Puerto Rico
(03-1995). Simple cross products of C*-algebras by coactions of compact matrix pseudogroups. Univ. of Rome
(03-1995). Strongly prime C*-algebras. University of Tel Aviv
(06-1993). Maximal subalgebras associated with one parameter C*-dynamical systems. Univ. of Rome, Torvergata.
(05-1993). Saturated actions of compact quantum groups on C*-algebras. Technion, Haifa, Israel.
(05-1993). Cross product C*-algebras by Hopf *-algebra actions. Univ. of Rome
(04-1993). Analytic algebras associated with periodic C*-dynamical systems. Univ. of Puerto Rico, Mayaguez.
(03-1993). Actions of Hopf *-algebras on C*-algebras. Univ. of Puerto Rico, Rio Piedres.
(1991). Index of fixed point algebras for finite group actions. GPOTS, Texas A&M University, College Station, TX.
(06-1990). Connes spectrum for group actions. Predeal, Romania
(1990). Spectra for compact group actions. GPOTS, University of New Mexico, Albuquerque, NM.
(05-1989). Maximality of analytic operator algebras associated with periodic flows. GPOTS, University of Houston.
(03-1989). Connes spectrum for compact nonabelian group actions. Southeastern Analysis Meeting, University of Georgia, Athens, GA.
(05-1988). Crossed products C*-algebras by compact group actions. GPOTS, Indianapolis, IN.
(10-1987). Duality and ergodic actions of simple Lie groups on operator algebra. 837th Meeting of AMS, Special Session, Lincoln, NE.
(1987). Ergodic actions of simple Lie groups on operator algebras. GPOTS, UK, Lawrence.
(1986). Ergodic group actions and crossed products. Operator algebras, UC Santa Barbara.
(1985). Crossed product C*-algebras by compact group actions. GPOTS, Texas A&M University.
(1985). Prime and simple crossed products. Operator Algebras and Math Physics Conference, Iowa City.
(1985). Ergodic actions commuting with compact action. Optimization and Operator Theory, Lincoln, Nebraska.
(1984). Non commutative topological dynamics. Annual Meeting AMS, Louisville.
(1982). Unbounded derivations of C*-algebras. Operator Algebras Seminar, Rome.
(1979). Reflexive algebras on non commutative Hardy Spaces. Annual Conference on Functional Analysis, Prague.
(1977). Invariant subspaces of operator algebras. Banach Center, Warsaw.
(1974). Invariant subspaces of von Neumann algebras. Seminar of Functional Analysis, Steklov Math. Inst., Moscow.
(1971). On a class of functional equations in C*-algebras". Oberwolfach, Germany.
