What is the result of this expression , It should mention that the log
is natural logarithm. $$ \log\left(\exp(-x) - \exp(-y)\right) $$
Could we use the formula which mentioned in wikipedia about logarithmic identities?
$$ \log_{b}(a -c) = \log_b a + \log_b(1- \frac{c}{a}) $$
and does any body know the refrence of the above mentioned formula in wikipedia?