<sod>  Generally, if a numerical problem is well-posed, it can be expressed as
 a function <math>f</math> mapping its data, which is an <math>m</math>-tuple 
 of real numbers <math>x</math>, into its solution, an  <math>n</math>-tuple of
real numbers <math>y</math>.
 
 Its condition number is then defined to be the maximum value of the ratio
 of the [[Approximation error|relative errors]] in the solution to the [[relative error]] in the data,
 <eod> <sod> Generally, if a numerical problem is well-posed, it can be expressed as
 a function <math>f</math> mapping its data, which is an <math>m</math>-tuple 
 of real numbers <math>x</math>, into its solution, an  <math>n</math>-tuple of
real numbers <math>f(x)</math>.
 
 Its condition number is then defined to be the maximum value of the ratio
 of the [[Approximation error|relative errors]] in the solution to the [[relative error]] in the data,
 <eod>