# R igraph manual pages

Use this if you are using igraph from R

## Vertex separators

### Description

Check whether a given set of vertices is a vertex separator.

### Usage

is_separator(graph, candidate)


### Arguments

 graph The input graph. It may be directed, but edge directions are ignored. candidate A numeric vector giving the vertex ids of the candidate separator.

### Details

is_separator decides whether the supplied vertex set is a vertex separator. A vertex set is a vertex separator if its removal results a disconnected graph.

In the special case of a fully connected graph with n vertices, each set of n-1 vertices is considered to be a vertex separator.

### Value

A logical scalar, whether the supplied vertex set is a (minimal) vertex separator or not.

### See Also

is_min_separator, min_separators lists all vertex separator of minimum size.

[Package igraph version 1.2.6 Index]