Research articles

   Research Articles

Orthonormal pairs of operators, Lin. Alg. and Appl. 648 (2022) 233--253.
Which states can be reached from a given state by unital completely positive maps?, Proc. Edinburgh Math. Soc. 65 (2022) 632--651.
Relative commutants of finite groups of unitary operators and commuting maps, J. Math. Anal. Appl. 500 (2021) 125123
Cones of completely bounded maps, Positivity 25 (2021) 1--29.
Operator systems and C*-extreme points, Studia Mathematica 247 (20019) 45--62.
Maps with the unique extension property and C*-extreme points, Complex Analysis and Operator Theory 12 (2018) 1903--1927.
On the range inclusion for normal derivations on C*-algebras, Proc. Edinburgh Math. Soc. 61 (2018) 1--11.
C*-convex sets and completely positive maps, Integral Eq. Op. Th. 85 (2016) 37--62.
Bicommutants and Arens regularity, Communications in Algebra 43 (2015) 4674--4697.
Variance of operators and derivations, J.M.A.A. 433 (2016) 1--30.
Bicommutants and ranges of derivations, Lin. Multilin. Alg. 61 (2013) 1161--1180, A Corrigendum in 62 (2014) 1272--1273.
With Matej Brešar and Špela Špenko: Identifying derivations through spectra of their values , Integral Eq. Op. Th. 73 (2012) 395--411.
Sums of products of positive operators and spectra of L\" uders operators, Proc. Amer. Math. Soc. 141 (2013) 1349--1360.
Fixed points of normal completely positive maps on B(H), J.M.A.A. 389 (2012) 1291--1302.
Approximation of maps on C*-algebras by completely contractive elementary operators,
Elementary Operators and Their Applications (R. E. Curto and M. Mathieu Eds.),
Operator Theory: Advances and Applications, Vol. 212, 25--39, Birkhauser, Basel, 2011.
Weak* continuous states on Banach algebras, J.M.A.A. 350/1 (2009) 252--255.
With David P. Blecher: Dual operator systems, Bull. London Math. Soc. 43 (2011) 311--320.
Uniform approximation by elementary operators, Proc. Edinburgh Math. Soc. 52/03 (2009) 731--749.
Pointwise approximation by elementary complete contractions, Proc. Amer. Math. Soc. 137/7 (2009) 2375--2385.
On weakly central C*-algebras, J.M.A.A. 342/2 (2008) 1481--1484.
On cogenerators among operator bimodules, H.J.M. 33/4 (2007) 1091--1115.
On tensor products of operator bimodules, J.O.T. 54:2 (2005) 317--337.
With David P. Blecher: Duality and operator algebras II: operator algebras as Banach algebras, J.F.A. 226/2 (2005) 485-493.
With David P. Blecher: Duality and operator algebras: automatic weak* continuity and applications, J.F.A. 224/2 (2005) 386--407.
Duality and normal parts of operator modules, J.F.A. 219/2 (2005) 306--339.
With Marko Petkovšek and Aleksej Turnšek: An operator inequality and self-adjointness, Lin. Alg. and Appl. 377 (2004) 181--194.
The norm of a symmetric elementary operator, Proc. Amer. Math. Soc. 132 (2004) 1747--1754.
With A. Turnšek, On the norm of symmetrised two-sided multiplications, Bull. Austral. Math. Soc. 67 (2003) 27--38.
On completely bounded bimodule maps over W*-algebras, Studia Mathematica 154 (2003) 137--164.
With Christian Le Merdy: A Factorization Problem for Normal Completely Bounded Mappings, J.F.A. 181/2 (2001) 313--345.
On C$^*$-extreme points, Proc. Amer. Math. Soc. 129 (2001) 771--780.
Normal operator modules and tensor products, Functional Analysis VII (Dubrovnik, 2001), Various Publ. Ser. (Aarhus) 46, Univ. Aarhus (2002) 131--142.
C*-convexity and the numerical range, Canad. Math. Bull. 43 (2000) 193--207.
C*-convex sets and completely bounded bimodule homomorphisms, Proc. Roy. Soc. Edinburgh 130A (2000) 375--387.
The minimal operator module of a Banach module, Proc. Edinburgh Math. Soc. 42 (1999) 191--208.
Module states and tensor products over abelian C*-algebras, Rev. Roum. Math. Pures Appl. 44 (1999) 85--95.
Factorization of certain completely bounded mappings, Functional analysis. V, Vol. I (Dubrovnik, 1997), Various Publ. Ser. (Aarhus) 44, Univ. Aarhus (1998) 71--75.
A Topology for Operator Modules over W*-Algebras, J.F.A. 154/1 (1998) 17--41.
Mappings preserving submodules of Hilbert C*-modules, J. London Math. Soc. 58 (1998) 153--162.
Hilbert $C^*$-modules in which all closed submodules are complemented, Proc. Amer. Math. Soc. 125 (1997) 849--852.
Strong operator modules and the Haagerup tensor product, Proc. London Math. Soc. 74 (1997) 201--240.
A Transitivity Problem for Completely Bounded Mappings, Houston J. Math. 23 (1997) 109--120.
Factorization of certain completely bounded mappings, Functional Analysis V, proc. of the Postgraduate School and Conference in the Inter-University center Dubrovnik 1997, published by University of Aarhus, 1998.
Hilbert modules and tensor products of operator spaces, Linear operators (Warsaw, 1994), Banach Center Publ. 38, Polish Acad. Sci., Warsaw (1997) 227--246.
Tensor products over abelian $W^*$-algebras, Trans. Amer. Math. Soc. 348 (1996) 2427--2440.
The Haagerup Norm on the Tensor Product of Operator Modules, J.F.A. 129/2 (1995) 325--348.
On the distance to finite-dimensional subspaces in operator algebras, J. London Math. Soc. 47 (1993) 516--532.
A transitivity theorem for algebras of elementary operators, Proc. Amer. Math. Soc. 118 (1993) 119--127.
Interpolation by elementary operators, Studia Mathematica 105 (1993) 77--91.
An application of reflexivity of finite dimensional subspaces of factors, Elementary Operators and Appl.: Proc. of the Internat. Workshop, Blaubeuren, 1991, World Scientific, Singapore (1992) 211--221.
On the essential numerical range of a generalized derivation, Proc. Amer. Math. Soc. 99 1987) 86--92.
On the relative reflexivity of finitely generated modules of operators, Trans. Amer. Math. Soc. 327 (1991) 221--249.
A note on Fredholm theory in semi-prime rings, Proc. Roy. Irish Acad. 89A (1989) 1--11.
A system of operator equations, Canad. Math. Bull. 30 (1987) 200--209.
On the operator equation ax+(ax)*-lx=b, Operator Theory: Advances and Appl. 17, Birkhauser Verlag, Basel, 1986.
On subnormality of generalized derivations and tensor products, Bull. Austral. Math. Soc. 31 (1985) 235--243.