<sod>  
 :<math>\left| \frac{ f'(x) }{ f(x) } \right| \cdot \left| x \right|. </math>
 
And the condition number of the inverse of <math>f</math> is approximately
 
 :<math>\left| \frac{ f(x) }{ f'(x) } \right| \cdot \left| \frac{1}{x} \right|. </math>
 
 <eod> <sod> 
 :<math>\left| \frac{ f'(x) }{ f(x) } \right| \cdot \left| x \right|. </math>
 
And the condition number of the inverse of <math>f</math> at <math>f(x)</math> is approximately
 
 :<math>\left| \frac{ f(x) }{ f'(x) } \right| \cdot \left| \frac{1}{x} \right|. </math>
 
 <eod>