Arithmetical forms of quasigroups
Arithmetical properties of finite rings and algebras, and analytic number theory. II.
Arithmetical semigroups defined by congruences.
Arithmetical theory of monoid homomorphisms.
Arithmeticity of the irreducible lattices in the semi-simple groups of rank greater than 1.
Arithmetisch definierte Gruppen mit Galoisoperation.
Around Podewski's conjecture
A long-standing conjecture of Podewski states that every minimal field is algebraically closed. Known in positive characteristic, it remains wide open in characteristic zero. We reduce Podewski's conjecture to the (partially) ordered case, and we conjecture that such fields do not exist. We prove the conjecture in case the incomparability relation is transitive (the almost linear case). We also study minimal groups with a (partial) order, and give a complete classification of...
Around the Borromean link.
This is a survey of some consequences of the fact that the fundamental group of the orbifold with singular set the Borromean link and isotropy cyclic of order 4 is a universal kleinian group.
Arrangements Defined by Unitary Reflection Groups.
Arrondissement des variétés à coins - Appendice à "Corners and Arithmetic Groups"
Artin Groups and Infinite Coxeter Groups.
Artin-Gruppen und Coxeter-Gruppen.
Artinian and noetherian factorized groups
Artin's conjecture, Turing's method, and the Riemann hypothesis.
Aspherical four-manifolds and the centres of two-knot groups.
Aspherical Group Presentations.
Aspherical Manifolds and Higher-Dimensional Knots
Asphericity of symmetric presentations
Using the notion of relative presentation due to Bogley and Pride, we give a new proof of a theorem of Prishchepov on the asphericity of certain symmetric presentations of groups. Then we obtain further results and applications to topology of low-dimensional manifolds.
Associative rings and the Whitehead property of modules [Abstract of thesis]
Associativity in monoids and categories