Check if coalitions are indifferent to one another, or, in other words, if they appear in the same equivalence class.

## Arguments

- powerRelation
A

`PowerRelation`

object created by`PowerRelation()`

or`as.PowerRelation()`

- c1
Coalition vector

- c2
Coalition vector

## See also

Other lookup functions:
`elementLookup()`

,
`equivalenceClassIndex()`

## Examples

```
pr <- PowerRelation(list(list(c(1,2)), list(1, 2)))
stopifnot(coalitionsAreIndifferent(pr, c(1,2), c(1)) == FALSE)
stopifnot(coalitionsAreIndifferent(pr, 2, 1) == TRUE)
# Note that it doesn't fail with non-existing power relations
stopifnot(coalitionsAreIndifferent(pr, 1, c()) == FALSE)
stopifnot(coalitionsAreIndifferent(pr, 3, c(1,2,3)) == TRUE)
```