Update READMEs.

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Oleksii Trekhleb
2018-04-13 17:49:39 +03:00
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Power set of a set A is the set of all of the subsets of A.
Eg. for `{x, y, z}`, the subsets are : `{{}, {x}, {y}, {z}, {x, y}, {x, z}, {y, z}, {x, y, z}}`
![Power Set](https://www.mathsisfun.com/sets/images/power-set.svg)
## References
* [Wikipedia](https://en.wikipedia.org/wiki/Power_set)
* [Math is Fun](https://www.mathsisfun.com/sets/power-set.html)