`log_a(x)=y <=> x=a^y`
1. `log_a(x) + log_a(y) = log_a(xy)`
2. `log_a(x) - log_a(y) = log_a(x/y)`
3. `log_a(x^k) = k * log_a(x)`
4. `log_a(1)=0`
5. `log_x(x)=1`
6. `log_a(x)=(log(x))/(log(a))`
7. `a^(log_a(x))=x`
This material is intended as a summary. Use your textbook for detail explanation.
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