# Arithmetic Course/Number Operation/Ln

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## Natural Log

If there is a power of two, 2b = a, then

log2 a = b which is equivalent to Ln a = b

## Rules

1. ${\displaystyle Lna+Lnb=Logab}$
2. ${\displaystyle Lna-Lnb=Log{\frac {a}{b}}}$