A function that gives the power set \(P(S)\) of any non empty set S.

`power_set(n, ordinal = FALSE)`

## Arguments

- n
an integer. The cardinal of the set

- ordinal
a boolean. If TRUE the power set is only composed of subsets of consecutive elements, FALSE (by default) otherwise.

## Value

A list of \(2^n -1\) subsets (The empty set is excluded)

## References

Devlin, Keith J (1979). Fundamentals of contemporary set theory. Universitext. Springer-Verlag

## Examples

```
# Powerset of set of 4 elements
set1 <- power_set(4)
# Powerset of set of 4 elements by only keeping
# subsets of consecutive elements
set2 <- power_set(4, ordinal = TRUE)
```