Lesson 5.3 File
Lesson 5.3 File

Math 201 Topology I
Math 201 Topology I

Note on fiber bundles and vector bundles
Note on fiber bundles and vector bundles

General Topology of Ramified Coverings
General Topology of Ramified Coverings

10/3 handout
10/3 handout

TOPOLOGICAL GROUPS - PART 1/3 Contents 1. Locally compact
TOPOLOGICAL GROUPS - PART 1/3 Contents 1. Locally compact

Discovering Geometry An Investigative Approach
Discovering Geometry An Investigative Approach

Spring 2015 Axiomatic Geometry Lecture Notes
Spring 2015 Axiomatic Geometry Lecture Notes

A QUICK INTRODUCTION TO FIBERED CATEGORIES AND
A QUICK INTRODUCTION TO FIBERED CATEGORIES AND

The Postulates of Neutral Geometry Axiom 1 (The Set Postulate
The Postulates of Neutral Geometry Axiom 1 (The Set Postulate

... alternate interior angles, then they are parallel. Corollary 6.12 (Corresponding Angles Theorem). If two lines are cut by a transversal making a pair of congruent corresponding angles, then they are parallel. Corollary 6.13 (Consecutive Interior Angles Theorem). If two lines are cut by a transversal ...
the topology of ultrafilters as subspaces of the cantor set and other
the topology of ultrafilters as subspaces of the cantor set and other

Page 1 of 1 Geometry, Student Text and Homework Helper 11/7
Page 1 of 1 Geometry, Student Text and Homework Helper 11/7

A Class of Vectorfields on S2 That Are Topologically Equivalent to
A Class of Vectorfields on S2 That Are Topologically Equivalent to

SimpCxes.pdf
SimpCxes.pdf

Generically there is but one self homeomorphism of the Cantor set
Generically there is but one self homeomorphism of the Cantor set

Fuzzy Topologies
Fuzzy Topologies

COMPACTLY GENERATED SPACES Contents 1
COMPACTLY GENERATED SPACES Contents 1

On closed sets in Topological Spaces
On closed sets in Topological Spaces

FINITE SPACES AND SIMPLICIAL COMPLEXES 1. Statements of
FINITE SPACES AND SIMPLICIAL COMPLEXES 1. Statements of

Math 190: Quotient Topology Supplement 1. Introduction The
Math 190: Quotient Topology Supplement 1. Introduction The

Basic Concepts of Point Set Topology
Basic Concepts of Point Set Topology

Notes from the Prague Set Theory seminar
Notes from the Prague Set Theory seminar

0.1 Localization
0.1 Localization

On πgr-Closed Sets in Ideal Topological Spaces
On πgr-Closed Sets in Ideal Topological Spaces

Full Text
Full Text

3-manifold



In mathematics, a 3-manifold is a space that locally looks like Euclidean 3-dimensional space. Intuitively, a 3-manifold can be thought of as a possible shape of the universe. Just like a sphere looks like a plane to a small enough observer, all 3-manifolds look like our universe does to a small enough observer. This is made more precise in the definition below.