NGETREN

E Bf E B Aa E A E A B E B E E A E Bc E Af E Bb E B Ef Bc F E A E Bd E Af E E Ef Bc F E F A E B E

.
E A E Bd E Ae A E B E Bb E B E Af Ef Bc F E F A E B E

= .
N Ef Bc F E E E B E B Aa E A A E B Ef Bc F E F A E B E

N nn \dfrac {\ln \left n ight \ln \left n ight } {n \left n ight } \left \ln n ight .
Formal Proof For Mathematics Stack Exchange

Is there a formal proof for $ \imes = $? It’s a fundamental formula not only in arithmetic but also in the whole of math. Is there a proof for it or is it justumed?.