Luzius Grunenfelder

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Telephone: (902) 494-3676
Office: 305
email: luzius@mathstat.dal.ca

Current Research


- Hopf algebras, deformations and extensions.
- Algebraic and geometric aspects of multiparameter spectral theory.
- Matrix algebras and matrix groups.

Recent Publications

- On Bimeasurings, (with M. Mastnak), to appear in J. Pure Appl. Algebra.
- Transitive action of Lie algebras, (with M. Omladic, H. Radjavi), J. Pure Appl. Algebra 199 (2005), 87-93.
- On semitransitive collections of operators, (with J. Bernik, M. Mastnak, H. Radjavi, V.G. Troitsky), Semigroup Forum 70 (2005), 463-450.
- Cohomology of abelian matched pairs and the Kac sequence, (with M. Mastnak), J. Algebra 276 (2004), 706-736.
- About braided and ordinary Hopf algebras, Milan j. math. 71 (2003), 121-140.
- Maximal Jordan algebras of matrices with bounded number of eigenvalues, (with T. Kosir, M. Omladic, H. Radjavi), Israel J. of Math. 128 (2002), 53-75.
- Semigroups generated by similarity orbits, (with M. Omladic, H. Radjavi, A. Sourour), Semigroup Forum 62 (2001) 460-472.
- Constructing pointed Hopf algebras by Ore extensions, (with M. Beattie, S. Dascalescu), J. Algebra 225 (2000), 743-770.
- Ascent and descent of finite sequences of commuting endomorphisms, (with M. Omladic), Pacific J. Math. 191 (1999), 95-121.
- On pointed Hopf algebras of dimension p^n, (with M. Beattie, S. Dascalescu), Proc. Amer. Math. Soc. 128 (2000), 361-367.
- On the number of types of finite dimensional Hopf algebras, (with M. Beattie, S. Dascalescu), Invent. Math. 136 (1999), 1-7.
- On groups generated by elements of prime order, (with T. Kosir, M. Omladic, H. Radjavi), Geom. Dedicata 75 (1999), 317-332.
- Finiteness conditions, co-Frobenius Hopf algebras and Quantum Groups, (with M. Beattie, S. Dascalescu, C. Nastasescu), J. Algebra 200 (1998), 312-333.
- Geometric aspects of Multiparameter Spectral Theory, (with T. Kosir), Trans. Amer. Math. Soc. 350 (1998), 2525-2546.
- Modules graded by G-sets, duality and finiteness conditions, (with D. Bulacu, S. Dascalescu), J. Algebra 195 (1997), 624-633.
- Koszul cohomology for finite families of comodule maps and applications, (with T. Kosir), Comm. Algebra 25 (1997), 459-479.
- Permutability of characters on algebras, (with R. Guralnick, T. Kosir, H. Radjavi), Pacific J. Math. 178 (1997), 63-70.
- On a representation of commuting maps by tensor products, (with T. Kosir), Lin. Alg. Appl. 251 (1997), 215-222.
- An algebraic approach to multiparameter Spectral Theory, (with T. Kosir), Trans. Amer. Math. Soc. 348 (1996), 2983-2998.
- Coalgebras and Spectral Theory in one and several variables, (with T. Kosir), Oper. Th. Adv. and Appl. 87 (1996), 177-192.

A selection of earlier publications

- Algebraic aspects of control systems and realizations, J. Algebra 165 (1994), 446-464.
- Jordan analogs of the Burnside and Jacobson transitivity theorems, (with M. Omladic, H. Radjavi), Pacific J. Math. 161 (1993), 335-346.
- Linearly recursive sequences and operator polynomials, (with M. Omladic), Lin. Alg. Appl. 182 (1993), 127-145.
- Tangent cohomology, Hopf algebra actions and deformations, J. Pure Appl. Algebra 65 (1990), 125-149.
- (Co-)homology of commutative coalgebras, Comm. Algebra 16 (1988), 514-576.
- Families parametrized by coalgebras, (with R. Pare), J. Algebra 107 (1987), 316-375.
- Graded algebras and their Euler-Poincare series, J. Pure Appl. Algebra 46 (1987), 165-178.
- On a commutator theorem of Robert C. Thompson, (with R. Pare, H. Radjavi), Lin. Multilin. Algebra 16 (1984), 129-131.
- Clifford k-algebras and k*-groups, Math. Z. 185 (1984), 137-150.
- Lower central series, augmentation quotients and homology of groups, Comment. Math. Helv. 55 (1980), 159-177.
- Isomorphic group rings woth non-isomorphic coefficient rings, (with M. Parmenter), Can. Math. Bull. 23 (1980), 245-246.
- On the homology of filtered and graded rings, J. Pure Appl. Algebra 14 (1979), 21-37.
- On the periodicity of the graded ring associated with an integral group ring, (with F. Bachmann), J. Pure Appl. Algebra 5 (1974), 253-264.
- Homological methods and the third dimension subgroup, (with F. Bachmann), Comment. Math. Helv. 47 (1972), 526-531.
- Ueber Lie-Ringe von Gruppen und ihre universellen Enveloppen, (with F. Bachmann), Comment. Math. Helv. 47 (1972), 332-340.
- Hopf-Algebren und Coradikal, Math. Z. 116 (1970), 166-182

Scholarly Contributions

- Book: Ueber die Struktur von Hopf-Algebren, Juris Druck & Verlag, Zurich (1969).
- Numerous refereeing jobs for various research journals.
- Assessing numerous dissertations.

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