Revert "Merge branch 'seanmason-issue-16' of https://github.com/seanmason/math-fun into seanmason-seanmason-issue-16"

This reverts commit a680f6ff1b2ec1882e3438b818f18d9dc909ec76.
Revert "Merge branch 'seanmason-issue-16' of https://github.com/seanmason/math-fun into seanmason-seanmason-issue-16"

This reverts commit 18817d3d2d1ffdfeaf8fcf815b6af76da07abe0f, reversing
changes made to aad8cda21bb59f228574ebcd0638f0c4a4f69b01.
Revert "Revert "Merge branch 'seanmason-issue-16' of https://github.com/seanmason/math-fun into seanmason-seanmason-issue-16""

This reverts commit de519ced33a0da94a49bda4d8628528d8e6e0331.
Revert "Revert "Merge branch 'seanmason-issue-16' of https://github.com/seanmason/math-fun into seanmason-seanmason-issue-16""

This reverts commit 40cf33bd496a62a252fc8ebc289e6bd70c872d51.