Congruence classes of orientable 2-cell embeddings of bouquets of circles and dipoles.
Congruence lattices of Rees matrix semigroups.
Congruence monoids
Congruence relations on cone semigroups.
Congruence relations on left canonic semigroups.
Congruence semimodularity of conservative groupoids
Congruence, Similarity, and Symmetries of Geometric Objects.
Congruence subgroups associated to the Monster.
Congruence subgroups of groups commensurable with of genus 0 and 1.
Congruence-free inverse semigroups.
Congruence-free regular semigroups with zero.
Congruence-preserving endomorphisms.
Congruences and ideals in ternary rings
A ternary ring is an algebraic structure of type satisfying the identities and where, moreover, for any , , there exists a unique with . A congruence on is called normal if is a ternary ring again. We describe basic properties of the lattice of all normal congruences on and establish connections between ideals (introduced earlier by the third author) and congruence kernels.
Congruences associated with inverse transversals.
Congruences between Siegel modular forms on the level of group cohomology
Vector-valued Siegel modular forms may be found in certain cohomology groups with coefficients lying in an irreducible representation of the symplectic group. Using functoriality in the coefficients, we show that the ordinary components of the cohomology are independent of the weight parameter. The meaning of ordinary depends on a choice of parabolic subgroup of , giving a particular direction in the change of weight. Our results complement those of Taylor and Tilouine-Urban for the two other possible...
Congruences of -group and of associated Hosszú-Gluskin algebras.
Congruences on an inverse Bruck-Reilly monoid. Part I: Non-group congruences.
Congruences on bands of π-groups
A semigroup S is said to be completely π-regular if for any a ∈ S there exists a positive integer n such that aⁿ is completely regular. The present paper is devoted to the study of completely regular semigroup congruences on bands of π-groups.
Congruences on Bruck-Reilly extensions of monoids.
Congruences on conventional semigroups