Difference of vertex sequences

## Usage

```
# S3 method for class 'igraph.vs'
difference(big, small, ...)
```

## Details

They must belong to the same graph. Note that this function has ‘set’ semantics and the multiplicity of vertices is lost in the result.

## See also

Other vertex and edge sequence operations:
`c.igraph.es()`

,
`c.igraph.vs()`

,
`difference.igraph.es()`

,
`igraph-es-indexing`

,
`igraph-es-indexing2`

,
`igraph-vs-indexing`

,
`igraph-vs-indexing2`

,
`intersection.igraph.es()`

,
`intersection.igraph.vs()`

,
`rev.igraph.es()`

,
`rev.igraph.vs()`

,
`union.igraph.es()`

,
`union.igraph.vs()`

,
`unique.igraph.es()`

,
`unique.igraph.vs()`

## Examples

```
g <- make_(ring(10), with_vertex_(name = LETTERS[1:10]))
difference(V(g), V(g)[6:10])
#> + 5/10 vertices, named, from 759b897:
#> [1] A B C D E
```