Wyniki wyszukiwania

1

A Čech function in ZFC

100%

Galvin F., Simon P.

Fundamenta Mathematicae

|

2007

|

tom 193

|

nr 2

181-188

EN

A nontrivial surjective Čech closure function is constructed in ZFC.

2

Open subspaces of countable dense homogeneous spaces

100%

Watson S., Simon P.

Fundamenta Mathematicae

|

1992

|

tom 141

|

nr 2

101-108

EN

We construct a completely regular space which is connected, locally connected and countable dense homogeneous but not strongly locally homogeneous. The space has an open subset which has a unique cut-point. We use the construction of a $C^1$-diffeomorphism of the plane which takes one countable dense set to another.

3

The space of ultrafilters on N covered by nowhere dense sets

80%

Balcar B., Pelant J., Simon P.

Fundamenta Mathematicae

|

1980

|

tom 110

|

nr 1

11-24

4

The smallest number of free closed filters

70%

Pelant J., Simon P., Vaughan J. E.

Fundamenta Mathematicae

|

1988

|

tom 131

|

nr 3

215-221

5

An example of maximal connected Hausdorff space

60%

Simon P.

Fundamenta Mathematicae

|

1978

|

tom 100

|

nr 2

157-163

Ograniczanie wyników

5 Fundamenta Mathematicae

5 Simon P.

2 Pelant J.

1 Balcar B.

1 Galvin F.

1 Vaughan J. E.

1 Watson S.

1 2007

1 1992

1 1988

1 1980

1 1978

A Čech function in ZFC

Open subspaces of countable dense homogeneous spaces

The space of ultrafilters on N covered by nowhere dense sets

The smallest number of free closed filters

An example of maximal connected Hausdorff space