Definition of logarithm w.r.t 2nd fundamental theorem of calculus

Description
Logarithm is defined by the second fundamental theorem. All the properties of logarithem are also explained with the help of fundamental theorem of calculus. The reasons for the function log x is negative for the value of x less than one, are analysed here.
Prof. Haynes Miller, Maths,18.01 Single Variable Calculus, Fall 2006: 19. Applications to Logarithms, Massachusetts Institute of Technology: MIT OpenCourseWare),http://ocw.mit.edu (Accessed July,10,2011). License: Creative Commons BY-NC-SA:http://ocw.mit.edu/terms/#cc