Calculation of Derivative.

Keyword Derivative,Logarithm,Euler numbers,Napier constant.

Reference [1]：オーム社編：『機械工学公式集』,オーム社,pp.20,1960.

Remarks ・LaTeX： \frac{d}{dx}log_{e}x= \frac{1}{x} ・Making above Equation Image is powered by CODECOGS

History ・2010/02/20：Upload.