# Avoiding infinity in pow and /

Taking 0 to the power of any negative exponent equals infinity. In Max, this yields the unique *float* value *inf*. In cases where you want to avoid getting *inf*, and would prefer to get *0*, you can simply make a special case for a *0* input, and pass it on directly, avoiding the **pow** object. On the left is an example of how to use **routepass **to force Max to output 0 when it would otherwise calculate infinity, such as when using a **pow -1 **object.

The same thing can happen when you divide a number by 0, the result of which is mathematically undefined. In Max, this yields the unique *float* value *nan* (not a number) or *inf*. In cases where you may encounter a division by 0 and wish to avoid the *nan* result, you can use **sel** to look for and prohibit sending the value 0 into the right inlet of the **/** object.

The** /!** object does this sort of protection automatically. If you try to divide by 0, it will send out *0.* instead of *inf*.