# Difference between revisions of "Path-connected space"

This is a variation of connectedness. View other variations of connectedness

## Definition

### Symbol-free definition

A topological space is said to be path-connected' or arc-wise connected if given any two points on the topological space, there is a path (or an arc) starting at one point and ending at the other.

### Definition with symbols

A topological space $X$ is said to be path-connected if for any two points $a,b \in X$ there is a continuous map $\gamma:[0,1] \to X$ such that $\gamma(0) = a$ and $\gamma(1) = b$.

## Metaproperties

### Products

This property of topological spaces is closed under taking arbitrary products
View all properties of topological spaces closed under products

A direct product of path-connected spaces is path-connected. This is true both for finite and infinite direct products (using the product topology for infinite direct products).

### Coarsening

This property of topological spaces is preserved under coarsening, viz, if a set with a given topology has the property, the same set with a coarser topology also has the property

Shifting to a coarser topology preserves the property of being path-connected. This is because a path in a finer topology continues to remain a path in a coarser topology -- we simply compose with the identity map from the finer to the coarser topology (which, by definition, must be continuous).

A union of a family of path-connected subsets having nonempty intersection, is path-connected.