# Simplifying an exponent using a constant rule

How do I use mathematica to simplify an exponent by breaking it up into its constituents and setting one of them equal to a constant?

For instance,

E^(k - 1/x)


would become

E^(k) * E^(1/x)


which I could then simplify to a using

 /.E^(k)->a

• Look here – corey979 Sep 5 '16 at 20:21
• You could do: E^(k - 1/x) /. k -> Log[a] – JungHwan Min Sep 5 '16 at 20:22