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LOGARITHM







                                  2 types of logarithms





                                      • Common logarithms



                                           Logarithms with respect to the base = 10



                                                    For example log 100 = 2
                                                                                     10

                                                    (Logarithm without a base is understood to be base 10)





                                      • Natural logarithms


                                           Logarithms with respect to the base e



                                                    where e = 2.71828...


                                                      log a  is written as ln a
                                                            e
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