লগের সূত্র

1. a^x = n হলে log_an = x

2. log_a MN = log_a M+ log_a N

3. log_a a^m = m.log_a a = m.1 = m

4. log_a (xyz…) = log_a x + log _ay + log_a z+……

5. log_a M^r = r log_a M

6. log_a^b .log_b^a = 1

7. log_a 1 = 0

8. log_a^p = log_b ^p . log_a^b

9. r log_a P = log_ap^r

10. log_a^a = 1