Vamos considerar a conectividade de coberturas por dominós usando movimentos locais.
Em particular, nos concentraremos no movimento conhecido como flip, no qual dois dominós adjacentes são removidos e recolocados em outra posição.
Em dimensão 2, é possível ligar quaisquer duas coberturas de uma região simplesmente conexa por meio de uma sequência de flips.
No entanto, em dimensão 3, existem regiões simplesmente conexas onde flips não são suficientes para conectar qualquer par de coberturas.

A ring (associative with identity) is called a fine ring if every nonzero element in it is the sum of a unit and a nilpotent element.  G. Cǎlugǎreanu and T.Y. Lam initiated the study of fine rings in  "Fine rings: a new class of simple rings.", J. Algebra Appl. (2016). In this talk, we review known results and discuss some new developments of this study.

We aim to study Morita theory for tensor triangulated categories. For two finite tensor categories having no projective simple objects, we prove that their stable equivalence induced by an exact k-linear monoidal functor can be lifted to a tensor equivalence under some certain conditions.

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Yuying Xu is currently a PhD student at Nanjing University and University of Stuttgart.

(This is joint work with J. Delgado and M. Roy) For two subgroups of a group, $H_1, H_2\leq G$, we can look at the eight possibilities for the finite/non-finite generability of $H_1$, $H_2$, and $H_1\cap H_2$. For example, all eight are possible in a free non-abelian group except one of them, expressing the well-known fact that free groups are Howson: intersection of two finitely generated subgroups is again finitely generated.

The classification of simple modules for a simple Lie algebra $\mathfrak{g}$ seems beyond reach: it is complete only for $\mathfrak{sl}(2)$. However, some classes of simple $\mathfrak{g}$-modules are well understood, such the category of weight modules with finite dimensional weight spaces. Irreducible weight representations were classified due to the effort of S. Fernando and O. Mathieu.

We introduce the Jordan-strict topology on the multipliers algebra of a JB*-algebra. In case that a C*-algebra $A$ is regarded as a JB*-algebra, the J-strict topology of $M(A)$ is precisely the well-studied C*-strict topology. We prove that every JB*-algebra A is J-strict dense in its multipliers algebra $M(A)$, and that the latter algebra is J-strict complete.

In 2004, Fit-Florea and Matula presented an algorithm for computing the discrete logarithm modulo  $2^{k}$ with logarithmic base 3. The algorithm is suitable for hardware support of applications where fast arithmetic computation is desirable.

A transposed Poisson algebra  is a triple $(\mathcal{L},\cdot,[\cdot,\cdot])$ consisting of a vector space $\mathcal{L}$ with two bilinear operations $\cdot$ and $[\cdot,\cdot]$, such that

1. $(\mathcal{L},\cdot)$ is a commutative associative algebra;
2. $(\mathcal{L},[\cdot,\cdot])$ is a Lie algebra;
3. the "transposed" Leibniz law holds: $2z\cdot [x,y]=[z\cdot x,y]+[x,z\cdot y]$ for all 
$x,y,z\in \mathcal{L}$. 

In this talk, an overview will be presented about hom-algebra structures, with focus on foundations and recent advances on graded (color) quasi Lie algebras, quasi-hom Lie algebras, hom-Lie algebras and related hom-algebra structures. These interesting algebraic structures appear for example when discretizing the differential calculus as well as in constructions of differential calculus on non-commutative spaces.

Hypercubes are arguably one of the most fundamental and most studied objects in Combinatorics. They have many nice properties which are very useful in several applications in Computer Science, one these properties being Hamiltonian - a graph is said to be Hamiltonian if it contains a cycle which goes through every vertex exactly once.