### Proceedings of the Baltic-Nordic Workshop Algebra, Geometry and Mathematical Physics

Tallinn, Estonia, October, 2005

Viktor ABRAMOV

Pages: 1 - 8

Given an associative unital ZN -graded algebra over the complex numbers we construct
the graded q-differential algebra by means of a graded q-commutator, where q is a
primitive N-th root of unity. The N-differential d of the graded q-differential algebra
is a homogeneous endomorphism of degree...

V ABRAMOV, O LIIVAPUU

Pages: 9 - 20

We propose a geometric approach to the BRST-symmetries of the Lagrangian of a
topological quantum field theory on a four dimensional manifold based on the formalism of superconnections. Making use of a graded q-differential algebra, where q is a
primitive N-th root of unity, we also propose a notion...

Nadezda BAZUNOVA

Pages: 21 - 26

In this article, we generalize a construction of graded q-differential algebra with ternary
differential satisfying the property d3
= 0 and q-Leibniz rule on the non-coordinate
case, that is on the case where the differentials of generators of underlying algebra do
not coincide with generators...

C. BURDIK, S. POSTA, O NAVRATIL

Pages: 27 - 36

We study the exact solvable 3 × 3 matrix model of the type G2. We apply the construction similar to that one, which give the 2 × 2 matrix model. But in the studied
case the construction does not give symmetric matrix potential. We conceive that the
exact solvable 3 × 3 matrix potential model of...

Cestmir BURDIK, Eugen PAAL, Juri VIRKEPU

Pages: 37 - 43

Canonical formalism for plane rotations is developed. This group can be seen as
a toy model of the Hamilton-Dirac mechanics with constraints. The Lagrangian and
Hamiltonian are explicitly constructed and their physical interpretation are given. The
Euler-Lagrange and Hamiltonian canonical equations...

Jurgen FUCHS

Pages: 44 - 54

The graphical description of morphisms in rigid monoidal categories, in particular in
ribbon categories, is summarized. It is illustrated with various examples of algebraic
structures in such categories, like algebras, (weak) bi-algebras, Frobenius algebras,
and modules and bimodules. Nakayama...

Tatjana GRAMUSHNJAK, Peeter PUUSEMP

Pages: 55 - 65

Let n be an integer such that n 3 and Cm denote a cyclic group of order m . It
is proved that there exist exactly 17 non-isomorphic groups of order 22n+1
which can
be represented as a semidirect product (C2n × C2n ) C2. These groups are given by
generators and defining relations.

Lars HELLSTROM

Pages: 66 - 75

This paper is an informal collection of observations on how established rewriting techniques can be applied to or need to be adapted for use in non-associative algebras,
operads, and PROPs.

Daniel LARSSON, Gunnar SIGURDSSON, Sergei D SILVESTROV

Pages: 76 - 87

This paper explores the quasi-deformation scheme devised in [1, 3] as applied to the
simple Lie algebra sl2(F) for specific choices of the involved parameters and underlying
algebras. One of the main points of this method is that the quasi-deformed algebra
comes endowed with a canonical twisted...

Eugen PAAL

Pages: 87 - 92

Deformation equation of a non-associative deformation in operad is proposed. Its
integrability condition (the Bianchi identity) is considered. Algebraic meaning of the
latter is explained.

Peeter PUUSEMP

Pages: 93 - 101

It is proved that among the finite groups of order less than 32 only the tetrahedral
group and the binary tetrahedral group are not determined by their endomorphism
semigroups in the class of all groups.

Maido RAHULA, Vitali RETSNOI

Pages: 102 - 109

Total differentiation operators as linear vector fields, their flows, invariants and symmetries form the geometry of jet space. In the jet space the dragging of tensor fields
obeys the exponential law.
The composition of smooth maps induces a composition of jets in corresponding
jet spaces....

Gunnar SIGURDSSON, Sergei D SILVESTROV

Pages: 110 - 128

We describe realizations of the colour analogue of the Heisenberg Lie algebra by power
series in non-commuting indeterminates satisfying Heisenberg's canonical commutation relations of quantum mechanics. The obtained formulas are used to construct new
operator representations of the colour Heisenberg...

Julia Y.-MAGNUSSON, Maxim SAMSONOV, Alexander STOLIN

Pages: 129 - 136

We propose a method of quantization of certain Lie bialgebra structures on the polynomial Lie algebras related to quasi-trigonometric solutions of the classical Yang-Baxter
equation. The method is based on so-called affinization of certain seaweed algebras
and their quantum analogues.