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exp
The expression exp z instead of ez is used for the exponential function to make it easier to read.
Explanation
Sometimes the exponent gets complicated during a calculation, like in
and you may prefer writing it as
Example 1
Euler's identity can be written as
Example 2
Logarithms can be written as
ln ez = z or ln (exp z) = z
az = ez ln a or az = exp (z lna)
Example 3
The power series for the exponential function can be written as