
上QQ阅读APP看书,第一时间看更新
Inverse functions
Inverse functions are a rather fascinating class of functions in that if we have two functions and we apply them on each other, we receive the identity. Mathematically, we define this as follows:
Suppose we have . Then, they are only inverse functions if
. For example, we could have
and
. Therefore,
, which tells us that
.
Here is another cool property that this has:
