# How do you express a single logarithm for log_e *M + log_e *T?

${\log}_{e} \left(M\right) + {\log}_{e} \left(T\right) = \ln M + \ln T = \ln \left(M T\right)$
Similarly, ${\log}_{e} \left(M\right) - {\log}_{e} \left(T\right) = \ln M - \ln T = \ln \left(\frac{M}{T}\right)$