1

Ultrafilters on a discrete set with two binary operations

Year:
1991
Language:
english
File:
PDF, 198 KB
english, 1991
2

Free groups in βN which miss the minimal ideal

Year:
1988
Language:
english
File:
PDF, 163 KB
english, 1988
3

Points very close to the smallest ideal of βS

Year:
1994
Language:
english
File:
PDF, 270 KB
english, 1994
4

Does N∗ contain a topological and algebraic copy of βN?

Year:
1990
Language:
english
File:
PDF, 701 KB
english, 1990
5

Flows, congruences, and factorizations

Year:
1994
Language:
english
File:
PDF, 854 KB
english, 1994
6

Multi-dimensional Ramsey theorems — An example

Year:
1992
Language:
english
File:
PDF, 110 KB
english, 1992
7

Groups associated with minimal flows

Year:
2005
Language:
english
File:
PDF, 105 KB
english, 2005
8

Transitive flows: a semi-group approach

Year:
1991
Language:
english
File:
PDF, 762 KB
english, 1991