Suppose that I {\displaystyle {}I} is a bounded closed interval,
is an ( n + 1 ) {\displaystyle {}(n+1)} -times continuously differentiable function, a ∈ I {\displaystyle {}a\in I} an inner point, and B := max ( | f ( n + 1 ) ( c ) | , c ∈ I ) {\displaystyle {}B:={\max {\left(\vert {f^{(n+1)}(c)}\vert ,c\in I\right)}}} .
Taylor polynomial, we have the estimate