A general formula is developed which gives the "best" approximation for any linear functional on the Hardy space H 2. Some "best" approximations are given for interpolation, differentiation, and ...

Numerical integration and differentiation techniques are commonly used in engineering, particularly when analyzing experimental data. Integration and differentiation of measured response signals can ...

Paul R. Lawrence, Jay W. Lorsch, Differentiation and Integration in Complex Organizations, Administrative Science Quarterly, Vol. 12, No. 1 (Jun., 1967), pp. 1-47 ...