## 3.13 Concept of Logarithm

“An admirable artifice which, by reducing to a few days the labour of many months, doubles the life of the astronomer, and spares him the errors and disgust inseparable from long calculations.”

— Pierre-Simon Laplace

• Log and Antilog
• $$log_24=?$$
• if $$log_2x=3$$, then x=?