Gruppentopologien auf nichtabelschen abzählbaren Gruppen.
Invariant sets in topology and logic
-groups versus -groups
We investigate free groups over sequential spaces. In particular, we show that the free -group and the free sequential group over a sequential space with unique limits coincide and, barred the trivial case, their sequential order is .
Lie groups in varieties of topological groups
Lie theory for semigroups.
Lokalkreisförmige Vektorgruppen.
Mapping Cylinders and Compact Monoids.
Multi-mobs.
Network character and tightness of the compact-open topology
For Tychonoff and an infinite cardinal, let the minimum number of cozero-sets of the Čech-Stone compactification which intersect to (generalizing -defect), and let . Give the compact-open topology. It is shown that , where: is tightness; is the network character; is the Lindel"of number. For example, it follows that, for Čech-complete, . The (apparently new) cardinal functions and are compared with several others.
Note on a Paper of T. Lezanski Concerning ΄΄Almost Reciprocal Operations΄΄
Notes on compact semigroups with identity.
On certain Conjectures on invariant measures on semigroups.
On Differential Equations in lie Algebroids
On Functions of Positive Type on Commutative Monoids.
On summability in convergence groups
On the -topology in groups
On -level topological groups.
Peripherality in semigroups.
Pontryagin duality for convergence groups of unimodular continuous functions
Problems 44 and 39 on compact semilattices.